Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83882e6f6488b2f…

MALICIOUS

PDF

57.8 KB Created: 2020-08-17 05:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f1555030af86875c0a84589b17b7b822 SHA-1: 0192327e4aa7622e2f8975c60b36970f25047030 SHA-256: b83882e6f6488b2fa5f07227af0e86c3e85fab63ebd72371321ad7a118248980
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains embedded JavaScript and a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text related to an 'answer key' and includes the malicious URL. This suggests a social engineering lure to trick users into visiting a malicious site, likely to download further malware. The PDF also contains a large number of external links, many hosted on Shopify, which is indicative of a link farm used for SEO poisoning or to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=rrb+allahabad+group+d+answer+key+2018 In PDF document text
    • http://files.isabeltamouro.com/uploads/1/3/0/7/130739011/1476220.pdfIn PDF document text
    • http://files.thespareroombook.com/uploads/1/3/0/9/130968984/3f710250c8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1549/6092/files/bebifewufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/61428545830.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8632/1566/files/patinomolenududuxiseje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/24801835621.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0077/4307/files/sandy_hook_fishing_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2893/0979/files/caddisflies_the_underwater_architects.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/5900820054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8339/8310/files/bugubinawaki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3876/7266/files/90712801214.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/edit_text_in_bluebeam_revu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1003/0748/files/dragon_nest_sea_2018_leveling_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/du_ma_sociology_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/iana_time_zones.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2103/1829/files/cypress_hill_discography.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B1 5900 bytes
SHA-256: 518e3c41ddb0a0a2334a3303ea0c587e1555d46851d0930e64957297e547cc7b
font_01_sfnt_off000085bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85BD 1936 bytes
SHA-256: 19d579821e83c32cd478aefcb57f849508ece8625c42f2108810477b29a00d2f
font_02_sfnt_off00008f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F03 11808 bytes
SHA-256: f2bbd82c223aac8bc4fdd766a3826996738cee009d706414141d9e12519fe2a8
font_03_sfnt_off0000b604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB604 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
font_04_sfnt_off0000c405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC405 6028 bytes
SHA-256: fca21d4273244dd101645064fa1c5b211da67d4e89545faa370275dfb5eadea9

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