Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ed9843b2c71519…

MALICIOUS

PDF

40.9 KB Created: 2020-08-16 23:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b93e6bfc0541a1738fcce09b6d81d2d2 SHA-1: 7d8aef6e58618237935eaf81a32ea7a3d20f4eb4 SHA-256: 39ed9843b2c71519e2445bf093e027dd8a7bb432d1579e69a48595d00bd66b97
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=plural+form+of+bacterium', which is flagged as a malicious redirector. This suggests the document's primary purpose is to lure the user into clicking this link, likely leading to a further stage of infection or a phishing attempt. The presence of many links hosted on Shopify, while individually benign, contributes to a link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=plural+form+of+bacterium
    • http://files.mosholudaycamp.com/uploads/1/3/0/9/130969312/bcfaed50065.pdf
    • https://cdn.shopify.com/s/files/1/0428/6152/7206/files/vuwolezodigoloxubeki.pdf
    • https://cdn.shopify.com/s/files/1/0433/7637/8014/files/babubut.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7086/files/burokedureduzanapew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/gijaru.pdf
    • https://cdn.shopify.com/s/files/1/0440/9108/0869/files/demon_hunter_pve_guide_bfa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9121/2950/files/problemas_de_aprendizaje_concepto.pdf
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/xisaru.pdf
    • https://cdn.shopify.com/s/files/1/0429/5258/9465/files/dagijezemewirasumesig.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3768/files/abs_workout_program.pdf
    • https://cdn.shopify.com/s/files/1/0436/1568/2717/files/theory_of_vibration_with_applications_thomson.pdf
    • https://cdn.shopify.com/s/files/1/0431/3209/2573/files/windows_10_upgrade_advisor.pdf
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/joxitorusa.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_off00005d2c.bin
0536210b8406a3543a597f293564527a0263caf735995eba3a4f02517cf53ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2C 4988 bytes
font_01_sfnt_off00006e0e.bin
821ad0beda558d06a30c2b0d6f3daac489dc711d4ddbb18ecf4c45e01c22a00c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0E 12436 bytes

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