Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be7d61fcd3e14ea…

MALICIOUS

PDF

54.1 KB Created: 2020-08-03 08:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 092accbe6eb8eba5cd30477560e054a8 SHA-1: ea0cdb1351d7ed2d88ff7dcbf8cd8212d65dfe26 SHA-256: 8be7d61fcd3e14ea18786aeafc44dc56d669535c7f68739649ff3baf16a803d7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=artforms+11th+edition+pdf+free'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the attack pattern.

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=artforms+11th+edition+pdf+free
    • http://files.nourishbodymindspirits.com/uploads/1/3/1/4/131438260/vupesavevisepemobak.pdf
    • http://files.martialhartamas.com/uploads/1/3/0/8/130814279/6186ec0be38b.pdf
    • http://files.crossroadsbrooklyn.com/uploads/1/3/0/9/130969118/2f1e86.pdf
    • http://files.why-knot.net/uploads/1/3/2/6/132682790/lipizo_dubafemizun.pdf
    • https://cdn.shopify.com/s/files/1/0438/1881/1552/files/pudotixinodomiwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8946/0376/files/17766360016.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/50501072172.pdf
    • https://cdn.shopify.com/s/files/1/0433/9872/5793/files/87504941269.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/12300310887.pdf
    • https://cdn.shopify.com/s/files/1/0437/6644/8277/files/xesaxis.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0789/files/after_effects_cs6.pdf
    • https://cdn.shopify.com/s/files/1/0433/9705/4631/files/44956683678.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/wijugasagovawuvoduxar.pdf
    • https://cdn.shopify.com/s/files/1/0430/0265/8979/files/73422794009.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/76834986513.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/42333054902.pdf
    • https://cdn.shopify.com/s/files/1/0435/0427/1524/files/53591506572.pdf
    • https://cdn.shopify.com/s/files/1/0432/1850/1799/files/hashtable_c_implementation.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087a5.bin
851ec2db0d47b647ca18f956fc434ed171e27be24538e8fc34790c5cff0f9057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A5 4868 bytes
font_01_sfnt_off00009809.bin
b9b0f583226486a3eca356afc7d0fa079150673269dc7618cd28b89fdabba74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9809 11096 bytes
font_02_sfnt_off0000bce2.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE2 4324 bytes

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