Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad998dcdb92c8f1…

MALICIOUS

PDF

42.9 KB Created: 2020-08-20 01:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 11548e406d000cfa69c2c3b03d435723 SHA-1: f5b113eabb68b087df35784a9cea6a7d161a8356 SHA-256: 3ad998dcdb92c8f1e15f5bd3fb5b9461e7cb085b001e9c0eaf90b09ae874d0ac
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to an annual report and the malicious URL, suggesting a lure to trick users into visiting the redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=bcpl+railway+infrastructure+ltd+annual+report In PDF document text
    • http://files.brookes.edu/uploads/1/3/1/4/131453354/7535991.pdfIn PDF document text
    • http://files.pink-backpack.com/uploads/1/3/2/6/132682882/setixanazal.pdfIn PDF document text
    • http://files.wilkersonhomesinc.com/uploads/1/3/1/3/131398406/84e5dda05163f1.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
    • https://cdn.shopify.com/s/files/1/0431/9376/1941/files/28532335219.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/gukomewudotutetavuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4847/6570/files/vurogaxawemakaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/36122193245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/57693820392.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8828/8675/files/baixar_jogos_para_android_hackeados.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6327/1833/files/janapadalu_songs_mp4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/bridal_chorus_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/88313696119.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 5

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000552f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x552F 5272 bytes
SHA-256: a0ef4764576ddfd97a00265fd75ccbf602deacdff6bd9acd3f5c197f4e75bc50
font_01_sfnt_off00006735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6735 12204 bytes
SHA-256: 4d044fc256c1dc1bd443659fd3c388f4d31753ee26a20b12e12ea568861e4e09
font_02_sfnt_off00008e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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