Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd3a8bdc4ccedf4…

MALICIOUS

PDF

40.0 KB Created: 2020-08-08 00:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88fb3761a895d1305f98a54fa47c5b29 SHA-1: f29a0bc406e20e3ef8380e0789e089a584ae9415 SHA-256: bfd3a8bdc4ccedf47478b9ff4b999700ecc3842e2b6e57cd264c1f7e0d80d95e
128 Risk Score

Malware Insights

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

The PDF contains a lure for a free book download, which is a common tactic for phishing or malware distribution. It embeds a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=bharat+acharya+8085+book+pdf+free+download'. Additionally, it hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm designed to improve search engine ranking for malicious content. The document body, though heavily corrupted, contains fragments of the book title and the malicious URL.

Heuristics 4

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=bharat+acharya+8085+book+pdf+free+download
    • http://files.landfallcert.com/uploads/1/3/1/3/131379111/6170381.pdf
    • http://files.islandwidefamilytours.com/uploads/1/3/1/8/131856627/a6dd41f2c6.pdf
    • http://files.craftingabitofsunshine.com/uploads/1/3/0/7/130775968/fanuzobofefuwa.pdf
    • http://files.grospiton.com/uploads/1/3/0/7/130775677/bd7fcb.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3382/files/lileresa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/gagefusup.pdf
    • https://cdn.shopify.com/s/files/1/0434/2480/9116/files/structural_composite_materials.pdf
    • https://cdn.shopify.com/s/files/1/0437/0877/6600/files/9391147617.pdf
    • https://cdn.shopify.com/s/files/1/0438/6809/4629/files/15560960765.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6645/files/navevagolobejowewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57515970725.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4711/files/45638422875.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/50655963785.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/future_simple_exercises_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13652925252.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/27228782901.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_off00005206.bin
94d067bb3882ac448cba1266b8773a81eeacbfb023a5e2b0a2105405041f6e55
pdf-font-stream PDF embedded font (sfnt) at offset 0x5206 5972 bytes
font_01_sfnt_off00006671.bin
2b792676939b70c21db8a2fe2641a4bf6a2bc6baeab8a41cf81d244980375828
pdf-font-stream PDF embedded font (sfnt) at offset 0x6671 14404 bytes