Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22d65f5d873ce99…

MALICIOUS

PDF

50.5 KB Created: 2020-07-30 23:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3073d860b0e845fd7f3bd7ed2a6dbff SHA-1: 3903552e0c7729d7540ccac2e4a5617fda5028e8 SHA-256: d22d65f5d873ce9969aac4406234d01c9e443f14a3a1a62ee344c8fc8f79f7ff
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or generate traffic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to PDF downloads, aligning with the link farm behavior.

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.ru/pify?keyword=reliability+engineering+singiresu+s.+rao+pdf+free+download
    • http://files.naturalsoaplady.ca/uploads/1/3/2/7/132740764/fce43300e.pdf
    • http://files.prohuntersights.com/uploads/1/3/0/7/130738993/3899047.pdf
    • http://files.lisabuckpottery.com/uploads/1/3/1/8/131871625/9557031.pdf
    • http://files.applefarmcommunity.org/uploads/1/3/1/8/131856991/3930156.pdf
    • http://files.applefa
    • https://cdn.shopify.com/s/files/1/0431/2426/1026/files/28960368717.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8722/files/95484777903.pdf
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/85273348745.pdf
    • https://cdn.shopify.com/s/files/1/0433/2178/6521/files/besomipigufezo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2587/files/tiberil.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9652/files/32518735011.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/8477060708.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/jitifozevikikirowifexubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6562/2184/files/woniwosafokixejawamebi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1029/files/gawebaweluzunopir.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1702/files/jutosedobisel.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/voxagakazigagapojazulibem.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/69513544115.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1415/files/ginegivotejujabete.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_off00008776.bin
05a402027403561a0037d9399f14d2e16e93ba20498e87609308929ea2716148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8776 5464 bytes
font_01_sfnt_off00009a30.bin
b2a4894b29e30746f366c3342820753810fa06f8a9477db6eca7e43689150d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A30 10052 bytes

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