Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd5333d263c8c58…

MALICIOUS

PDF

34.1 KB Created: 2020-08-12 08:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd4708dab6e831870c3f3070fe9e5811 SHA-1: 820c0e5680281c6eedd8d66c22cf3919c37529b8 SHA-256: bcd5333d263c8c581b7f6e177a41fd8cb505cdc252a50c29af99012418d0e363
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates a link to a known malicious redirector, 'ttraff.cc', which is likely used to obscure the final destination or distribute malware. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, potentially to drive traffic to malicious sites or to host malicious content disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=basin+street+blues+score+pdf
    • http://files.thecooleygallery.com/uploads/1/3/2/6/132695782/kazitugowa.pdf
    • http://rititano.mewellc.com/uploads/1/3/0/8/130814788/8534003.pdf
    • http://files.ashleypontephotography.com/uploads/1/3/1/8/131871854/tefalamad_rimatoripumip.pdf
    • http://kelidi.clearwaterdesigns.net/uploads/1/3/2/8/132814930/sasodavol-gasis-dajabeneluviges-relirurexokodur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/loxutiwijadewafulon.pdf
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/52174595568.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/18124066383.pdf
    • https://cdn.shopify.com/s/files/1/0428/9776/8614/files/46419330749.pdf
    • https://cdn.shopify.com/s/files/1/0434/7818/8198/files/10920185534.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/75073533469.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/aptitude_test_questions_and_answers_with_solutions_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0759/files/sutexafal.pdf
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/jurelawadekizigisojir.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/28838207331.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/62064740688.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_off00004730.bin
29193b1410ef4c118de12d24ba69140c3ff1aff27f24a4ae99a01ac454b81916
pdf-font-stream PDF embedded font (sfnt) at offset 0x4730 5336 bytes
font_01_sfnt_off00005950.bin
991ccf63dfdfe5e330eddadad8db21b68f53f0894f18ebb7bf125c734f8a60b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5950 10036 bytes