Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1bedf285976dc1…

MALICIOUS

PDF

43.0 KB Created: 2020-08-12 15:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 718f502c5685f4533b76db4a51b41ca0 SHA-1: 8b33c8b8108b42e91d4ed6a7601eed0a7263ab23 SHA-256: 3d1bedf285976dc15c36aa2d19c7294252a6420219d7eafce80ae935f177f5e5
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is the primary indicator of malicious intent. The document body, though heavily obfuscated, contains the URL that leads to the redirector, disguised as a link to 'basic english writing practice pdf'. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to attract victims. The redirector URL is the highest priority IOC.

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.cc/wb?keyword=basic%20english%20writing%20practice%20pdf In PDF document text
    • http://files.fivehardfilmshow.com/uploads/1/3/1/8/131857916/5816439.pdfIn PDF document text
    • http://files.cvgc1991.org/uploads/1/3/1/4/131410479/jawogisubukobudetev.pdfIn PDF document text
    • http://files.happyhoundsk9training.com/uploads/1/3/1/3/131383251/3608864.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/1/0434/0226/4741/files/5754522891.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6117/2631/files/zobagujasajoligumuxaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/egg_biryani_recipe_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/67364140940.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0292/1123/files/wulanazibemexonetel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/60189084791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5511/9520/files/star_wars_republic_commando_cheats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3088/6053/files/93232317740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8492/2526/files/44053222082.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/6263629195.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 3

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_off000069cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69CC 5556 bytes
SHA-256: 2a2e8c3071e719668c733e075f0922d12139a7a8f1b519d25d10f0ade9b2789e
font_01_sfnt_off00007cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB2 10068 bytes
SHA-256: c838cfb4d7277e7d28c16e75e76a0ecc71f2ac6dfa9f9693aa1c027667d4e83e

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