Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b785ed8a843db4…

MALICIOUS

PDF

56.5 KB Created: 2020-07-31 03:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 52eb8184ddf6a44bc4296dffe50bced5 SHA-1: af518e916bc2f76993a6355d1256e247a7f087c0 SHA-256: 31b785ed8a843db48f7757149ef3ee8f75722c9b73b149ca7a2b69445767774c
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious URL. Additionally, PDF_SEO_LINK_FARM suggests the PDF is part of a link farm, likely for SEO manipulation or to distribute malicious links. The document body, though heavily obfuscated, contains text related to 'ketogenic diet recipes pdf free', serving as a lure. The primary IOC is the malicious redirector URL.

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=ketogenic+diet+recipes+pdf+free In PDF document text
    • http://files.msumun.org/uploads/1/3/1/4/131408537/1f52dfa8d.pdfIn PDF document text
    • http://files.spaceonetwoone.com/uploads/1/3/2/6/132680962/makipa.pdfIn PDF document text
    • http://files.biblestudylife.com/uploads/1/3/1/6/131606248/414e62bf7.pdfIn PDF document text
    • http://files.fallscreekcc.com/uploads/1/3/2/6/132695535/wifol.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/1/0432/9160/7190/files/23049620916.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5905/2706/files/34388241562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/66043759293.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/luxak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9265/4745/files/27244026431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7789/3270/files/28349266118.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/fofuwonomibeles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/lexanuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/35900838225.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5312/0669/files/46435476704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0273/9363/files/vejadikolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1500/4582/files/pefinifik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/45840048651.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBC 4836 bytes
SHA-256: 0db7dafa18509eacd3f2737c05e33eab6003441b0bb97a9497942fc468cc5a52
font_01_sfnt_off0000b04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04D 10644 bytes
SHA-256: bac356461cac85537d22d7e0450050d458afad62edc1dcf1b70ec8985d63dd80

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