Malicious PDF — malware analysis report

Static analysis result for SHA-256 831c8e09c30d1c9c…

MALICIOUS

PDF

72.0 KB Created: 2020-08-05 11:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 232eed78c5777e5d44a6a69593126d5f SHA-1: f9d205c72335ae782177fc5e10502faa2143bb5e SHA-256: 831c8e09c30d1c9c10f0a9d6842f4d905d7a99b46e38660c6f5c0e32b178ee31
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to medical treatment and the wkhtmltopdf tool, suggesting a lure. The presence of a password-protected archive lure heuristic indicates an attempt to bypass security controls by encrypting a payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/pify?keyword=insuficiencia+cardiaca+congestiva+tratamiento+farmacologico+pdf
    • http://files.theskinthatburns.com/uploads/1/3/2/8/132814967/loluwetojome.pdf
    • http://files.gruffcorn13.com/uploads/1/3/1/4/131438137/9691198.pdf
    • http://files.kaseimart.com/uploads/1/3/0/7/130739404/gixakeku.pdf
    • http://files.obsidianrenewables.com/uploads/1/3/0/7/130776886/lojuv.pdf
    • http://files.sarahmbarkleylcsw.com/uploads/1/3/1/8/131871778/polekuno.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/1/0433/0687/7080/files/tazoxusejeko.pdf
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/finivuzasukasunomepamuma.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/nomokavesabarotumil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0511/6575/files/75221965407.pdf
    • https://cdn.shopify.com/s/files/1/0432/4022/6984/files/vovefowol.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/world_break_season_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9623/files/final_fantasy_14_act.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/wikiwaxutike.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/vugobapire.pdf
    • https://cdn.shopify.com/s/files/1/0436/7689/3334/files/14815995784.pdf
    • https://cdn.shopify.com/s/files/1/0436/0352/5794/files/46956738353.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_off0000d8a6.bin
79a8a8498ad81242a5d4f152db9f9d11ff13934f56072b0d4f1ed165f1f29538		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 5472 bytes
font_01_sfnt_off0000eb3d.bin
3a573231dde8824b6b019ac137a7267893721ef6a2da64d8046f4435049cf52f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 11324 bytes

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