Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8efdc48c73c0a1…

MALICIOUS

PDF

41.1 KB Created: 2020-08-05 18:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06eafc81e71d64146a8b76dc0438a921 SHA-1: de9e2e9be51d2492a45d01a9a76b3056b6890564 SHA-256: 6c8efdc48c73c0a18d79c337aed8385245b60f194be2176b8d093e784ce71d35
154 Risk Score

Malware Insights

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

The PDF document contains embedded links designed to appear as a manual for a smoke alarm, but the primary link redirects to a known malicious domain. The document also features a large number of other PDF links, many pointing to benign Shopify URLs, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to harmful content.

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.ru/wb?keyword=firex%20smoke%20alarm%20i4618%20manual
    • http://files.fotographia.ch/uploads/1/3/1/6/131606652/7855149.pdf
    • http://dunenofi.whiterabbitdesigncompany.com/uploads/1/3/1/6/131606349/4629404.pdf
    • http://files.barbimacon.com/uploads/1/3/1/6/131606366/virab.pdf
    • http://files.chatteriemainecoonroswell.com/uploads/1/3/0/7/130738806/6066150.pdf
    • http://files.fpsch.com/uploads/1/3/2/7/132740275/gitemedera.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4854/1079/files/brother_mfc_j435w_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/wabutodibuve.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/90870242261.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/nevaro.pdf
    • https://cdn.shopify.com/s/files/1/0436/2502/1603/files/romeo_santos_formula_vol_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/9381/9541/files/92117995393.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/43156252145.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/98286080112.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5798/files/somezazujuwijaresejugo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0435/6905/3854/files/fawudawezum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0432/1184/files/19513560394.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/bitelamenofufixoror.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_off000062f7.bin
3c763a5750aad9b8209d939c57127ac8a3d15d8d08441f077ddf3c1ff3c04ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F7 5404 bytes
font_01_sfnt_off00007553.bin
b010770689eaaaf472df2403d8b9d0436c462b68d1975cb8cc74768426f1406c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7553 10008 bytes

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