Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d93612d178a500…

MALICIOUS

PDF

67.3 KB Created: 2020-08-07 00:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de6d2f55972869b0178e0c62b057d0c5 SHA-1: 20b389dd7056d8c8a40416136d4e619611f0ddc5 SHA-256: 15d93612d178a5006500e894f07604fc489ae720ff88faaf8dbb4e401de5ec75
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to what appears to be a link farm designed to artificially boost SEO, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'network cabling book pdf' and the malicious URL. This suggests a phishing or redirection attack where the document is presented as a benign resource to entice clicks on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=network+cabling+book+pdf
    • http://files.ocarmburgosph.org/uploads/1/3/1/4/131411539/96699.pdf
    • http://files.voicesbubble.us/uploads/1/3/1/0/131071252/xuwivozo.pdf
    • http://files.thestore99613.com/uploads/1/3/1/4/131414743/387fd0.pdf
    • http://files.maryhigginswebdesign.com/uploads/1/3/0/7/130775921/fec3396eeff417d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92283418618.pdf
    • https://cdn.shopify.com/s/files/1/0436/9262/1978/files/fifagebagopun.pdf
    • https://cdn.shopify.com/s/files/1/0433/4836/1375/files/mesanusatu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/basic_branches_of_philosophy.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1559/files/78104218161.pdf
    • https://cdn.shopify.com/s/files/1/0435/0210/8836/files/59393069334.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/personas_toxicas.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9032/files/78281866849.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/fabojegajujol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/movikulewerudazuxedo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/network_monitoring_for_dummies_solarwinds.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_off0000c259.bin
5618f618e550705a9c00cdd40a5fdc360cceb67136f7fc94bdc47e8b3cc103d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC259 5408 bytes
font_01_sfnt_off0000d4eb.bin
56b7c19010e6d0d5611a6ad1becb3481d4725b5ca5526f36114d2a63b54b4f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 13976 bytes

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