Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c64c5e2065635d…

MALICIOUS

PDF

41.0 KB Created: 2020-08-20 19:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2296c0531863d707b0e6cbc0c6184bb SHA-1: b3cccb032c1603a52df559745386a0d1a1f66a1c SHA-256: f4c64c5e2065635d2b2875c686b217186d3085b80cf50f28dc45b76240161721
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector link to 'ttraff.com', suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains the same URL and appears to be generated by wkhtmltopdf, a tool often used to create malicious PDFs. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates an attempt to distribute malicious content or phish users. The primary malicious IOC is the redirector URL.

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.com/pify?keyword=opposite+to+emotion+action+worksheet+pdf
    • http://womabipim.jeffkirchoff.com/uploads/1/3/0/7/130740051/dobatajaviro-fidujavikuvat.pdf
    • http://files.zaidiecooper.com/uploads/1/3/2/7/132740511/7639881.pdf
    • http://rusitelus.legendarystrengthgym.com/uploads/1/3/1/3/131384536/pekununo.pdf
    • http://fepuwijo.auroramay.ca/uploads/1/3/1/3/131379685/117c8b97.pdf
    • http://files.hanlabdrexel.com/uploads/1/3/1/6/131606289/miwalo-nitadifavure.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/2601770868.pdf
    • https://cdn.shopify.com/s/files/1/0432/1827/2417/files/86157522710.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8673/files/dorunutotowotawa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9254/1589/files/72729965835.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/1484302633.pdf
    • https://cdn.shopify.com/s/files/1/0437/7575/4389/files/convertir_documento_en_ingles_a_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0429/2204/9695/files/61327373540.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/xakajekuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/56020961200.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40313354442.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_off00006180.bin
0ac08e299e0e35f1866d83304388635bac72dc5bfc5286e3a0100635904ddce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6180 5544 bytes
font_01_sfnt_off0000743a.bin
09606a888a20b7aa6e88e47000395b8656f2c47052210f35104822b22ec534db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743A 10376 bytes

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