Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd74d05be760f886…

MALICIOUS

PDF

42.5 KB Created: 2020-08-29 02:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a284540cbebe4374a1ce3a75a9c3a89 SHA-1: 83d97ceb598f37b22190dde8640e1ab6164d2792 SHA-256: fd74d05be760f8866e55abf488866e50e31a47bf154388ed8749aa514b67dd9c
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and heuristics indicate it functions as a link farm, containing numerous external links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=prehistoric+shark+teeth+guide'. The document body, though heavily obfuscated, also contains this URL and other URLs hosted on Shopify, suggesting a coordinated effort to distribute malicious content or phish users.

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/wix?keyword=prehistoric+shark+teeth+guide
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/busapewuforaze.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4449/files/jorufi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6605/files/sidugexanupok.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/fear_of_god_sermon.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1846/files/medical_terminology_suffixes.pdf
    • https://static.usrfiles.com/ugd/b8c837_304c82db875343c7814cc21b1dfc30bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7d1ee1b78a9442ca693c84e1bd26f27.pdf
    • https://static.usrfiles.com/ugd/b8c837_10e08f0e5c124c609bac4c9cf503a20d.pdf
    • https://static.usrfiles.com/ugd/b8c837_acc9a0ef34ef4775a595f7283c0cb497.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e9739adb50e479a87f65fc5b70b1637.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/kuviruwobosepe.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/microsoft_it_academy_certification_roadmap.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0317/files/gexirasolal.pdf
    • https://static.usrfiles.com/ugd/b8c837_61705d94a7234f11af07d7fbdb21bd2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_131b139a46394c5aaed18cd7a6a23c7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_986d6d3f0bde48f389dc74c1d2969c71.pdf
    • https://static.usrfiles.com/ugd/b8c837_61606fcdfd534038ab0ee0893f09605f.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_off0000696e.bin
74b62312a9f10760bae51bf47afffe772fb017a9d03fd2d69719dd306418eca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696E 5236 bytes
font_01_sfnt_off00007b2a.bin
833499e77e8443473796f0738c4ca92e1e87d01c4bab7cb7decc8c09f0c57738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2A 9812 bytes

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