Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8997edb9d20de3…

MALICIOUS

PDF

41.6 KB Created: 2020-09-17 10:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010909ae2e60379da8f48370a2af4222 SHA-1: 5bc1e40c5845547fca6318f5d9f015d53b784803 SHA-256: 5a8997edb9d20de381e938e3da7a0330739e230c737ce35595d712920f59dd3c
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a redirector service that is known to host malicious content. The document body also contains text related to downloading software, reinforcing the lure. The presence of numerous external links, including those to Shopify, suggests an attempt to create a link farm for SEO poisoning or to distribute payloads.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=skype+for+business+apk+free+download
    • http://files.neosvf.com/uploads/1/3/2/7/132741535/vixegi.pdf
    • http://kutijore.ginstephens.com/uploads/1/3/1/3/131380739/wurebenojebulu-nunotefos-tujidedirewejak.pdf
    • http://dogigido.jaxscakesnbakes.com/uploads/1/3/0/8/130874488/letobo.pdf
    • http://files.derrickanthonyking.com/uploads/1/3/1/4/131454505/199e8f7f22d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7090/5756/files/holoenzyme_and_apoenzyme.pdf
    • https://cdn.shopify.com/s/files/1/0434/4312/6438/files/dumujunoduxaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4677/1607/files/simple_and_compound_interest_word_problems_worksheet.pdf
    • https://d4b4a664-a029-4ea2-b58d-ec0fc092c9c2.filesusr.com/ugd/296484_1559a695ea5a4fd0a774537bc924d5b9.pdf?index=true
    • https://cc1be322-9e98-4b5d-87d7-21e5d78b1f6c.filesusr.com/ugd/2c8d66_75e7c09c59ce40ea890e49696470a1e0.pdf?index=true
    • https://5e0d899e-e2d4-42e6-b47c-60e3cb793222.filesusr.com/ugd/8ac1ab_12efc8425afb45029dce5b30b3d160b4.pdf?index=true
    • https://653734a0-00eb-4d96-8dfd-30ccb61a0e35.filesusr.com/ugd/98e298_7397180ac1494606bbeb9730f72d23e5.pdf?index=true
    • https://d373c9bc-d36e-4b66-baf1-98daaf09dc06.filesusr.com/ugd/e6092c_a13ad4837deb4ee387e7c86107e6ae71.pdf?index=true
    • https://56f14c38-14d7-484f-94d0-af20c7b341ad.filesusr.com/ugd/3be3a7_a7e98084792d4dadb81e6ddc2d9cd129.pdf?index=true
    • https://94593de0-dbdf-4234-a9bb-bce741cec564.filesusr.com/ugd/28b3f7_68e2ecd3471e49268d3f8c60c64e7ecd.pdf?index=true
    • 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_off0000637d.bin
91fbd772975a7b312eccc58ec74b84e1e397ffddc538d2ddfea2cd7766d4f6b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637D 5536 bytes
font_01_sfnt_off00007678.bin
5dbe944f668f974ac22c9941ae98ee2673a9641945f7a7aa8606caeb0b6d53b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7678 10332 bytes

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