Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b8c0c8c891cae0…

MALICIOUS

PDF

82.1 KB Created: 2020-08-08 08:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0635d1bccb57a93ec3bf3a1b939f6a16 SHA-1: 48b214d4229864e7bae109c4a57746412d938135 SHA-256: 31b8c0c8c891cae0f4cc55dc0e408fb2f76015a2224b419aa976ee3a20e83e8c
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=biuret+test+journal+pdf'. This indicates the document's primary purpose is to redirect the user to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, further suggests a link farm or SEO poisoning tactic to distribute the malicious content. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer the attack pattern.

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/pify?keyword=biuret+test+journal+pdf In PDF document text
    • http://files.northwestpetroleum.com/uploads/1/3/2/8/132814123/17065ea.pdfIn PDF document text
    • http://files.yourendoflifeguide.com/uploads/1/3/1/4/131437983/3669221.pdfIn PDF document text
    • http://files.madelinemullenbach.com/uploads/1/3/2/8/132816096/30a6a0.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/1/0431/1734/6976/files/lonafipivuvosipitozujamon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9730/6776/files/91629470096.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/changeling_the_lost_2nd_edition_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1110/5191/files/bookkeeping_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2784/6552/files/wenejige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9651/3448/files/71312245651.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6038/0327/files/mongodb_aggregation_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1464/4127/files/79239944338.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5421/0980/files/78904187195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4555/9189/files/10_day_weather_forecast_new_orleans.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5012/2916/files/30782377280.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 6

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_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 5040 bytes
SHA-256: 757888dcc92b503e5d67ded88eec3bad9f7e542d6311cfe195bd2ff16043f364
font_01_sfnt_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 12724 bytes
SHA-256: 8826a16330011f77695fae67fb0f61d74496dcb7fc32405af29a4a4131a548b5
font_02_sfnt_off00012d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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