Malicious PDF — malware analysis report

Static analysis result for SHA-256 480bae8d7f0412be…

MALICIOUS

PDF

42.0 KB Created: 2020-08-07 17:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af22ad051a780c01c2e6cde6284be32a SHA-1: ab72d429b493d497565a1900b0e8613397f82420 SHA-256: 480bae8d7f0412bea410a2b355317fbc45830681fbe63d770bd038898bfc80d7
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL embedded in the document body. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the link https://ttraff.ru/pify?keyword=xiaomi+airdots+manual+pdf leads to known malicious infrastructure. The document body, though heavily obfuscated, contains references to 'Xiaomi airdots manual pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious links. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=xiaomi+airdots+manual+pdf
    • http://files.grassingtondevonshireinstitute.org/uploads/1/3/2/6/132681851/0982864.pdf
    • http://files.kodawarisake-edu.com/uploads/1/3/1/3/131379382/rolaluwivezif-todolox.pdf
    • http://files.dairyflatponyclub.org/uploads/1/3/2/7/132740362/3692449.pdf
    • http://files.swellamy.com/uploads/1/3/1/3/131379183/276072.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/balzac_and_the_little_chinese_seamstress_full_text.pdf
    • https://cdn.shopify.com/s/files/1/0439/8006/2878/files/42770733120.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/96145260952.pdf
    • https://cdn.shopify.com/s/files/1/0433/2175/3758/files/97908955963.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0494/files/9615638702.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0434/7002/8966/files/foundations_of_astrophysics_ryden_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/43985411588.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/vibofitupotoralezog.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/dewoluwewugupebepawefad.pdf
    • https://cdn.shopify.com/s/files/1/0435/6974/1983/files/solubilities_of_inorganic_and_organic_compounds_pdf.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_off000066ae.bin
a75e44c89249bf482f47244e3fd52a87ac769839481b191acbd5dd85217f7e71
pdf-font-stream PDF embedded font (sfnt) at offset 0x66AE 5164 bytes
font_01_sfnt_off00007825.bin
52abeeb479a1e02851a560f76d3a545edaa8aada4fadefc879c58f761fb0c464
pdf-font-stream PDF embedded font (sfnt) at offset 0x7825 10488 bytes