Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3e14f2b0822cfd…

MALICIOUS

PDF

36.1 KB Created: 2020-08-11 01:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac987791148797ada0ebc7f0e7b82133 SHA-1: 6841cdff72bee61239894b4dc64d4ee79c8d60ed SHA-256: 6f3e14f2b0822cfd9b9c557c80c1770cedd4ce1847e68df506e52b76e058d175
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=complete+pet+cambridge+libro+pdf
    • http://mugude.triplecreekkennels.com/uploads/1/3/1/4/131453536/13c29ed5c.pdf
    • http://files.muralsbymckell.com/uploads/1/3/1/4/131406140/1249128.pdf
    • http://files.musicforyouth.net/uploads/1/3/0/7/130775806/1426436.pdf
    • http://files.authorrebeccaarogers.com/uploads/1/3/1/6/131637034/wakobobo_jujorufaxeso_puxul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2724/2906/files/brother_hl2270dw_driver.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/71889319263.pdf
    • https://cdn.shopify.com/s/files/1/0443/7016/5916/files/adm_logo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7873/files/salokowotugapozolapivesus.pdf
    • https://cdn.shopify.com/s/files/1/0439/7708/0990/files/circular_motion_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/4407/7722/files/kundalini_awakening_meditation.pdf
    • https://cdn.shopify.com/s/files/1/0440/4294/4677/files/nejavefagibekikusamufusi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/23841221034.pdf
    • https://cdn.shopify.com/s/files/1/0439/1796/7528/files/gokodofovugururulagig.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/sikosatuvukexoxofo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/kawusirikeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/3038/8642/files/25669315557.pdf
    • https://cdn.shopify.com/s/files/1/0438/3365/5446/files/badminton_score_sheet_philippines.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_off00004de8.bin
8f2d20181a9bcd2b584fb9cf6f403740b10d4135eb51992776ecf43da818b8a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE8 5340 bytes
font_01_sfnt_off00005ff4.bin
152c2eee12e10c9d83c9c7eb642ace9ed490d825bb8bed4eab978dd6c2c0a3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF4 9920 bytes

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