Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f69c2225b80b22c…

MALICIOUS

PDF

42.0 KB Created: 2020-08-13 23:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c66acbe59a9b8227e6ec93a553c768b2 SHA-1: 78098192d4832d46ec4e50b0428f868f5b3a0f58 SHA-256: 5f69c2225b80b22c177e14d053f25655a9839c8a09d7103231f76561660b94bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link disguised as a workforce diversity policy template. This link leads to a link farm of numerous other PDF files, indicating a potential phishing or malware distribution scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector URL further supports this assessment.

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=workforce+diversity+policy+template
    • http://files.spinninpolestudio.com/uploads/1/3/0/9/130969390/3567937.pdf
    • http://files.k911tacticalcare.com/uploads/1/3/1/3/131383512/3287548.pdf
    • http://nuvalax.lyraphotography.net/uploads/1/3/1/6/131637047/fidukipeg.pdf
    • http://files.chalmerslondon.com/uploads/1/3/1/4/131414743/9045763.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2191/7598/files/50959147060.pdf
    • https://cdn.shopify.com/s/files/1/0434/7956/4448/files/93578024136.pdf
    • https://cdn.shopify.com/s/files/1/0434/5449/6935/files/roxetosupesi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3459/7784/files/menatavogebonumu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0951/files/xosaboxixetozuvodipabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/water_pollution_essay_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0436/1663/2992/files/stanley_myers_cavatina_piano.pdf
    • https://cdn.shopify.com/s/files/1/0433/5324/3806/files/40984233898.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/65885412792.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/fimarufobokogimopelidivaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8281/files/58132823150.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/wonadivabi.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_off000066e4.bin
42dec3f38822a1c7657d97e5b6d2a594f5e99f2067b99956e266867341a179ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x66E4 5540 bytes
font_01_sfnt_off000079c3.bin
da0d0dec8303ccff8a9b12525ee8ca165c89542a1640ffe7d33f29070673e399
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C3 9820 bytes