Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccfe1d949525494…

MALICIOUS

PDF

39.0 KB Created: 2020-09-04 03:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74e5aa56860f543664c203b6df6bd27b SHA-1: 280fd9e5b6d9b065e943d777e1078177dc7f8151 SHA-256: 5ccfe1d9495254942f0f1c2d148b38dbf59d30379672482da01f7f254af328f0
214 Risk Score

Malware Insights

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

The PDF contains a lure for a 'Chrome app update' and embeds numerous links, one of which, 'https://ttraff.com/wix?keyword=chrome+app+update', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting a social engineering attempt to trick the user into clicking it. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=chrome+app+update
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3b47cb_bc8032b6ba474ad9a5e32072dbc9d81d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecb7db2ebfd14b9392d61fde998c4381.pdf
    • https://static.usrfiles.com/ugd/b8c837_169ef3c8b5bf44cd98003b3c48c365e9.pdf
    • https://static.usrfiles.com/ugd/54fa57_413333a8921549faa5fbd9f5b5bfcff5.pdf
    • https://static.usrfiles.com/ugd/26938b_001366a7a7584f4b9b57d2f3f8a2bb2e.pdf
    • https://static.usrfiles.com/ugd/ef253e_95c74e0ac0bf4df2a9722eb11207eff5.pdf
    • https://static.usrfiles.com/ugd/493135_c244a20c819747c7bbf873e36524a6fe.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/dazagiruzotopixixoleze.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5286/files/68379147980.pdf
    • https://static.usrfiles.com/ugd/66c878_16f5e7a6e4f749fda121b197d5121f62.pdf
    • https://static.usrfiles.com/ugd/6260fe_5b2eab4d2eaf457ab349719a644a3149.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_off00005c72.bin
dc85affbe204c86568699d2381cd217a5cf816f4d5955bed0d5114faf9f42420		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C72 4892 bytes
font_01_sfnt_off00006cde.bin
82d7e6ee8d662a792698be437e42d892b5c7f4479440051f170241ddfb81bc6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDE 10192 bytes

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