Malicious PDF — malware analysis report

Static analysis result for SHA-256 6155af3c7c1d856e…

MALICIOUS

PDF

53.0 KB Created: 2020-10-11 20:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b8fe486505996d7a470cfc5bd3d97c5e SHA-1: e0bc9498b038e5dc41d21d0cd8c5e31c7b3a58e4 SHA-256: 6155af3c7c1d856ef0949b5ca264d03230c90d1c2d9e52f9a4946109a41eb554
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to suspicious domains, and is flagged as a malicious redirector and link farm. The document body, though partially corrupted, contains text suggesting it is a lure for academic materials, which is a common tactic for distributing malware. The ML classifier strongly indicates maliciousness.

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.club/pify?keyword=holt+handbook+third+course+answers+chapter+3 In PDF document text
    • http://files.ddfefit.com/uploads/1/3/1/3/131378918/4d5902fdbb6cc5a.pdfIn PDF document text
    • http://jefuzuz.midlandsmortgages.co.uk/uploads/1/3/1/6/131606758/petasoputefom.pdfIn PDF document text
    • http://jamiv.avhauling.com/uploads/1/3/0/8/130814559/3544999.pdfIn PDF document text
    • http://files.2eshop.com/uploads/1/3/0/7/130776499/ratabevaderevew.pdfIn PDF document text
    • http://lefixuva.sakemicoclub.com/uploads/1/3/0/7/130739664/aed126.pdfIn PDF document text
    • http://laguner.garyscollision.com/uploads/1/3/2/8/132814930/selagezakusirasofa.pdfIn PDF document text
    • http://mopokilo.ksguns60478.com/uploads/1/3/2/6/132695643/sutitarisijojiwuge.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/1/0434/3224/7445/files/melevasidab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2079/5556/files/dogabivaxamatiwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7394/4217/files/biographical_sketch_example_for_elementary_students.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2294/4922/files/rolling_on_a_river_tina_turner_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8959/1461/files/lesigobetexilifeseto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5622/9269/files/condensed_blights_collected_io.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1378/3719/files/liwuzexozovop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6088/6694/files/48963181766.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000914f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x914F 5584 bytes
SHA-256: aaca95975bce7272b9dcd5ba484f19ae0367044bb2f0b8df422af7e8bb84081d
font_01_sfnt_off0000a445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA445 10248 bytes
SHA-256: 00ddd993a066284a6ba082d4a3ef6ee577a92d833d0dc7beb43cdbad5cfea0ba

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