Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02d25a0bcb1329c…

MALICIOUS

PDF

46.4 KB Created: 2020-07-27 20:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ffb0728883cf6335c620fdd58fc7b54 SHA-1: 86afe67cd6d601ca0ed60615a97ae7664c21399f SHA-256: d02d25a0bcb1329c4fc2afabbcb6deb09c62b187b509e183b0d9d03bba2d149e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector (ttraff.cc). The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this. Additionally, the 'PDF_SEO_LINK_FARM' heuristic indicates a large number of outbound links, many hosted on shopify.com, suggesting an attempt to generate traffic or distribute content through a link farm. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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=nsw+fair+trading+auditor%2527+s+guide
    • http://files.imgonnastandup.org/uploads/1/3/0/8/130874338/1515507.pdf
    • http://files.longlakehounds.com/uploads/1/3/0/8/130813755/gedaseriguropa-xavapolubeviwa-soxukavesidumor-kagixudox.pdf
    • http://files.inside-osijek.com/uploads/1/3/1/8/131856333/limunazolorug_wagox_xebawowobowi_xasifomuwob.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/dikadegasudalodagigob.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/famorigumal.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/novonulozo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/gevek.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4663/files/runepejepuwuraleb.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/vakituxalosaxogawasimo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89089693040.pdf
    • https://cdn.shopify.com/s/files/1/0432/0234/7168/files/68093455770.pdf
    • https://cdn.shopify.com/s/files/1/0438/1730/4226/files/65906982171.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/xovanutitigeja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16949815227.pdf
    • https://cdn.shopify.com/s/files/1/0432/4121/0024/files/nuxezijurotusisijilibolul.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/62488477587.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/mibanedasaferomaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/suref.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_off00007647.bin
d163e1ece9bec10803b981cdcbd1dd4d21c2eb73a4592538ae9de5f5975de064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7647 5020 bytes
font_01_sfnt_off0000877c.bin
9d38f97c17235dda0ad3501ad4abdd8ad3ba2af54ba7652e0221192d783670e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877C 10644 bytes

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