Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39faac980a01e7f…

MALICIOUS

PDF

41.0 KB Created: 2020-11-01 19:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a329523400cc9758b2f8b000420397dd SHA-1: c8301dc4803d5b26318bbbb92e0d737c7ddaab6e SHA-256: b39faac980a01e7f44b04c0a5dca34bdb7971ba2d015aae4e08b8f07eead9fd2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the malicious URL, suggesting the intent is to trick the user into visiting it. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.me/123?keyword=dishonored+death+of+the+outsider+trophy+guide
    • https://kulufitobapesad.weebly.com/uploads/1/3/4/4/134443603/1857286.pdf
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/1563849.pdf
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/bosilo_ginasesif.pdf
    • https://xapinetevum.weebly.com/uploads/1/3/4/3/134330578/rapogom-vopimakujokoro-lavemujon-makosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wujapu/15264498392.pdf
    • https://uploads.strikinglycdn.com/files/857b2ade-ad3d-401f-8365-2835d7308733/vipuvibizovurosowabire.pdf
    • https://cdn.shopify.com/s/files/1/0505/2671/6100/files/polite_expressions_in_english.pdf
    • https://s3.amazonaws.com/gurowozenupifi/de_dana_dan_full_movie_watch_online.pdf
    • https://uploads.strikinglycdn.com/files/b8162c57-02a4-43b1-8ab6-0db0cb3cf7a7/revel_the_sociology_project_2.5.pdf
    • https://cdn.shopify.com/s/files/1/0479/1671/2100/files/30259013651.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2651/files/xaruwakilixukivedar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006221.bin
e41e650d48819144527ae63d1b68caecd6fdc7338e6b2f301c0d9e05e867b1a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6221 5372 bytes
font_01_sfnt_off00007471.bin
5e12a4263e038a05e1624075a71cb487fda9dd7d573022f535c4a15414feb3da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7471 10112 bytes

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