Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5bd6441d64770c…

MALICIOUS

PDF

43.1 KB Created: 2020-08-02 19:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 949efac464ababcebe25c0383bf4066c SHA-1: a991991086a9b8abc6fa195da66838b5cda09635 SHA-256: 0c5bd6441d64770c274e14140c489d7060293ac40264fee9d902f11cb46ef4c5
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, disguised as a manual. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm designed to obscure the final malicious destination. No scripts were extracted, but the primary attack vector appears to be the malicious URL embedded within the document.

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=caterpillar+3208+manual+pdf
    • http://files.brockskillslab.com/uploads/1/3/2/6/132682851/tawemib.pdf
    • http://files.expo4seniors.com/uploads/1/3/1/4/131452836/wovaxuwobu_fapurega_tijugijupit.pdf
    • http://files.chrisvanwyhe.me/uploads/1/3/1/6/131636625/7325094.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7018/5879/files/4874088312.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/linobolibodexarotejowi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1931/files/4537896973.pdf
    • https://cdn.shopify.com/s/files/1/0436/7230/5817/files/wutinapagapofewed.pdf
    • https://cdn.shopify.com/s/files/1/0436/5117/0457/files/zexanebilugikuzarod.pdf
    • https://cdn.shopify.com/s/files/1/0437/8175/0941/files/dibuwilewepizafexadefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/sepix.pdf
    • https://cdn.shopify.com/s/files/1/0435/7714/7547/files/34208614079.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/98802375644.pdf
    • https://cdn.shopify.com/s/files/1/0434/1065/3338/files/68830802244.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/xebofimukinenetek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a04.bin
c40ba771ab1a8da31e1483700b56c550ef8e4f6b58d53a79265f211c6d3e6846		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A04 5436 bytes
font_01_sfnt_off00006c60.bin
b194bec16295eb96d0d88336b84ec59a8968f6678eb0fd28f0abfdc38e5a9c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C60 10872 bytes
font_02_sfnt_off00009174.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9174 4324 bytes

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