Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43c9e61f4873d33…

MALICIOUS

PDF

47.0 KB Created: 2020-08-04 22:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6628d31ff1c424f8b85b0e6552958d59 SHA-1: 2f1d03f5d10a27682576e073b4a1baead208e113 SHA-256: c43c9e61f4873d33f50521bcb95791e8427925c1ce48b2d72653b41645a50cde
120 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'https://ttraff.ru/pify?keyword=costing+analysis+pdf'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, with 'https://cdn.shopify.com/s/files/1/0430/4060/4313/files/pikarofofatixuliwa.pdf' being the first listed. The document body, though heavily obfuscated, contains text related to 'Costing analysis pdf' and the authoring application, suggesting a lure.

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.ru/pify?keyword=costing+analysis+pdf
    • http://files.shorterforschools.com/uploads/1/3/1/4/131407227/xopidegifi.pdf
    • http://files.professionaltalker.com/uploads/1/3/0/8/130814056/a200a4e.pdf
    • http://files.arcawa.org/uploads/1/3/0/8/130814531/217142.pdf
    • http://files.gbpsu.org/uploads/1/3/1/4/131408970/xirisa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4060/4313/files/pikarofofatixuliwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8539/files/82532608965.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/kelami.pdf
    • https://cdn.shopify.com/s/files/1/0437/0857/9993/files/34948085044.pdf
    • https://cdn.shopify.com/s/files/1/0428/3524/7271/files/80445756670.pdf
    • https://cdn.shopify.com/s/files/1/0430/5525/1605/files/64569855080.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19463184481.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/xarevukazanuga.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5005/files/67039467699.pdf
    • https://cdn.shopify.com/s/files/1/0437/2470/1845/files/polycythemia_causes.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/dezoxoxalu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/dexewiwuriv.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_off00007a2c.bin
d1368ee7312fd6d49b950ea67485504840e828d5cbed2fa440a27efbcd716cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2C 5120 bytes
font_01_sfnt_off00008bbd.bin
c5e4521a4281de02b284d3cfb5322e0d9b9c062ef93f7701d1254d6be5b777f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBD 10336 bytes

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