Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb74bda5d9b3c08e…

MALICIOUS

PDF

37.7 KB Created: 2020-08-22 02:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08204666ad33ee378b564c7dbaf2ec88 SHA-1: 2586700f6e9163a4f8ea64cb6b4cb5435c6a539a SHA-256: bb74bda5d9b3c08e38cb6da019605cc94c8cf35f072bdec092583c9e87fcfbd9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify, likely as part of a link farm to improve SEO for the malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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.com/pify?keyword=linear+equations+functions+and+inequalities+answers
    • http://files.ferrychurch.org/uploads/1/3/2/7/132740892/069257b368.pdf
    • http://files.vibrant-energies.com/uploads/1/3/0/8/130873907/nomadu.pdf
    • http://vitile.mcrossmantheatre.com/uploads/1/3/1/4/131438428/bafubinejajox-guvipewokefiwo-wefuwumux-pelosup.pdf
    • http://tatozu.csandss.net/uploads/1/3/1/0/131070161/kadidux.pdf
    • https://cdn.shopify.com/s/files/1/0436/5660/9957/files/aws_practice_exam_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/8383/3249/files/puxarisamutawolipukezazot.pdf
    • https://cdn.shopify.com/s/files/1/0438/5298/8566/files/75827728964.pdf
    • https://cdn.shopify.com/s/files/1/0439/3664/5275/files/jaxuforurodidumaluxejokin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4629/files/biology_of_belief_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/poxuvufarepaxawirolinega.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/99179717074.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/papoxemuronawa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0184/7708/files/pillars_of_eternity_2_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/2843/7409/files/international_arbitration_act_2017.pdf
    • https://cdn.shopify.com/s/files/1/0450/2175/7590/files/bhagavad_gita_700_slokas_in_telugu.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_off000054a3.bin
627ee3ea6d3da67517b6c3c2baa48bd6e135a669f1c4986b73724287d0f12c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x54A3 5172 bytes
font_01_sfnt_off00006655.bin
82e4519bcbdf3c7cf7a9bcf9db35ba5a75f1dc02ed10dd5b128174f12c1df455
pdf-font-stream PDF embedded font (sfnt) at offset 0x6655 10360 bytes