Malicious PDF — malware analysis report

Static analysis result for SHA-256 6391f71f51e83b0b…

MALICIOUS

PDF

46.8 KB Created: 2020-08-08 12:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff73dbb2eb9f0e93ba8b61c2e8f36bd2 SHA-1: 0ad706ba85e98dbb8ffbe4408d237c8a03ccb0fe SHA-256: 6391f71f51e83b0b52fb5cf8ab8fb4b127aed02b70c00a304c8dbfc6ccb7bb1f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is used to disguise the true destination. The document body also contains this URL, along with numerous other links to Shopify, likely as part of a link farm to improve SEO for malicious content. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=quantitative+aptitude+tricks+and+shortcuts+pdf+free+download+in+tamil
    • http://files.jbandersenart.com/uploads/1/3/1/4/131408344/9494649.pdf
    • http://files.barbarablumenthalehrlich.com/uploads/1/3/2/6/132695384/lomusozejoleka-rafosini-pavikulogidilus.pdf
    • http://files.musicmarketingmaneuvers.com/uploads/1/3/0/8/130814284/xosenapikefe.pdf
    • http://files.meadrdmardigras.org/uploads/1/3/2/7/132710632/valasapipeda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/applied_physics_for_engineers_by_neeraj_mehta.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/23952204923.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1553/files/86311504335.pdf
    • https://cdn.shopify.com/s/files/1/0436/7079/8489/files/buyer_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/nuzijuxagituvuxonarupeber.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/10323368316.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/digugajudadodi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/35883670640.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/darkrp_kidnapping_mod_1._16.pdf
    • https://cdn.shopify.com/s/files/1/0431/7079/1573/files/wamumowudi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8887/9521/files/kafevevekafavifi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3444/1885/files/separate_chaining_hash_table.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f93.bin
1e1c0dc01d0b789bdc8205000954b988557afb0d175870d2e4d590b39f275556		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F93 5672 bytes
font_01_sfnt_off000072ca.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CA 2116 bytes
font_02_sfnt_off00007c94.bin
bfd16de85862ce1650d0b62f6ad3903dbc9b40dfdc21d4422b8a22a4e53d5f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C94 14992 bytes

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