Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ac367e53024c74…

MALICIOUS

PDF

45.5 KB Created: 2020-08-10 00:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fe2bef94487900f541fecd99d45ddcfc SHA-1: 75873a9bf662ac7ee185f74b876b918ac8f5ea0e SHA-256: 31ac367e53024c749ca43dd444a121298f096f5f84ec16b5f5a2e2b2e49a336d
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. This suggests the primary purpose is to trick users into clicking the malicious link, likely leading to further compromise.

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=substitution+method+problems+and+answers+pdf In PDF document text
    • http://files.jenniferchapin.net/uploads/1/3/1/3/131380687/1826936.pdfIn PDF document text
    • http://wumuwal.hrkamins.com/uploads/1/3/0/7/130776561/7967228.pdfIn PDF document text
    • http://jegag.triplecrownbaseball.com/uploads/1/3/0/8/130874330/xegalowevagufipadaba.pdfIn PDF document text
    • http://files.bonplan-pinel.com/uploads/1/3/2/7/132740892/zejudezotesudol-tamifiwami-famisixo-puxunijefo.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/1/0432/3622/9278/files/gumavikatofibux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6874/4099/files/16140257064.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/43855065949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9030/3381/files/autonomous_polytechnic_colleges_in_maharashtra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/catalogo_andrea_escolar_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8818/3456/files/48241005840.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0677/8777/files/5447763040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/19205461063.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/31563961976.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 7

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_off00006b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3D 5616 bytes
SHA-256: dcb72450a74381c1d71bc33f2846dca15f5dc89f68617ba64696a80555651eb0
font_01_sfnt_off00007e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2E 13696 bytes
SHA-256: 0ab98a3774c27a34ffda998d1eb992544c4e31e0c94aa8c4bf57d9bd7f65491d

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