Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeef5abbe5144ae8…

MALICIOUS

PDF

57.5 KB Created: 2020-08-10 20:40:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b912ee2f8af6113c230ed6614930b059 SHA-1: 708751c7a4c3dee290dea30c69667c40608779ce SHA-256: eeef5abbe5144ae897d68e78172c84cdee64bef5f70bb08d3603172182ce0bd0
150 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=convert+base64+string+to+pdf+javascript'. This redirector is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains references to base64 string conversion and PDF JavaScript, aligning with the redirector's keyword. The presence of a large number of external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility.

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=convert+base64+string+to+pdf+javascript
    • http://files.innerjourneycanada.com/uploads/1/3/0/8/130813524/6eb5a836e19.pdf
    • http://files.developass.com/uploads/1/3/1/3/131383483/9914529.pdf
    • http://files.macsnapshot.com/uploads/1/3/1/8/131856498/nakunexedod-xafovowovivu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/44301920492.pdf
    • https://cdn.shopify.com/s/files/1/0429/9833/3599/files/zip_code_to_lat_long.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7500/files/23350430961.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/2779350039.pdf
    • https://cdn.shopify.com/s/files/1/0433/3436/9438/files/the_kite_runner.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/persona_4_max_social_link_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9880/files/mitevokorugito.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/19334175954.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92835403356.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/kilisigobazidijarova.pdf
    • https://cdn.shopify.com/s/files/1/0439/3736/6174/files/alienasi_karl_marx.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/tesezuwarumovezisuxugik.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/
    • https://cdn.shopify.com/s/files/1/0439/3736/61

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b0a.bin
e5a9a2721ac2254513b4976645d8262caab78938add62174d41e642597b3f37c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0A 5716 bytes
font_01_sfnt_off00007e97.bin
7ef4102b71f3d9d5404aa0ddfc9d589a9f0a05f41c66934d062ec4b237e0e730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E97 4064 bytes
font_02_sfnt_off00008e2a.bin
2cbae015f6810cafacaa7e275895985729ae947a76c088f16063dcfedfd7a000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2A 15896 bytes
font_03_sfnt_off0000c0a9.bin
2660e3f19262e0c1c514f7a0045fa503cee1831b49ccf21a997877b0058606e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A9 16756 bytes

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