Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf3da2a82dc4897…

MALICIOUS

PDF

47.2 KB Created: 2020-08-19 07:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 128f849b4cb5bb202605e00ed9d86135 SHA-1: d8e1c4d06b08c8059110d49edf0e32edd3d18e97 SHA-256: 9bf3da2a82dc4897aa072676ca3f1059eee25c33deb6e4c462141600ef8be378
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on the malicious URL, which likely leads to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=miocardiopatia+dilatada+ni%25C3%25B1os+pdf
    • http://files.kingfisherboatsontario.com/uploads/1/3/1/0/131071067/8469103.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/kepesewesogi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4556/1254/files/zomeradidabagukonixosubig.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/73797104867.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/runerubamedazepamefurase.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9709/files/78073492767.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/selebesikaja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000784d.bin
7ebd4ddf9fa09c813737b620603d534fdb19336ef9e0fc508dd2328ad0f5c5be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784D 5364 bytes
font_01_sfnt_off00008a54.bin
ea22a6c56cf36b6d19fde1663fc2c8a7798f65079bb6f41a94927d6b3fd8ca4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A54 11140 bytes

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