Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b631ddceb55fcf…

MALICIOUS

PDF

43.2 KB Created: 2020-08-23 04:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: db2e4575007f1ac8fad9e01a777051ab SHA-1: d8a8bab3b0e20eaa7dd55c4863cd479d53d4b141 SHA-256: a7b631ddceb55fcfc43c7795ca158570d5a38591e9fa2363496a7ac9815d343f
202 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure related to an 'answer key', likely to trick users into clicking the malicious link. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, further supporting a malicious distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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=aakash+2018+answer+key+neet In PDF document text
    • http://fulez.hobbsandhall.com/uploads/1/3/2/3/132302815/b4b32df8c.pdfIn PDF document text
    • http://files.28bullets.com/uploads/1/3/2/8/132816042/wolamonakow-puzawoxeme-zovoguki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7462/4419/files/15352640004.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/um_texto_expositivo_argumentativo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1281/5010/files/administrao_estratgica_de_servios_gianesi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/tefas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3543/2859/files/75017772100.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4218/4095/files/can_you_americas_cardroom_on_ipad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9484/1246/files/ridojuxekamepomadudupu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/rosetil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6091/9461/files/55519536366.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4209/2694/files/lost_city_quest_osrs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/57108393398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5268/5717/files/python_append_to_dictionary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7183/1193/files/50126239925.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
🗂 Part of campaign: 28bullets.com 3 samples

Related samples 2

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69A6 5508 bytes
SHA-256: 03ea2120761f6e6f3724acd8614a5d4fba2840c7dca20e4a7e2080ad8c3b53cb
font_01_sfnt_off00007c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6A 10524 bytes
SHA-256: 2032ea449d2527a8fde448dc2e976b2e415722eee29b84e897306e079f76a736

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