Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6b13df03287501…

MALICIOUS

PDF

37.8 KB Created: 2020-08-12 15:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2944e95fb2170b62e55674cb28fc2f08 SHA-1: 73365486d0306b59af6a4e2154c472c61c83a433 SHA-256: 8b6b13df0328750149daec56f39f0f3304c48bab0988215af61dd09f2c92982d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary link, 'https://ttraff.cc/pify?keyword=all+falls+down+piano+sheet+pdf', is identified as malicious. The document body, though heavily obfuscated, contains this same URL, suggesting the intent is to trick the user into clicking the malicious link under the guise of providing piano sheet music. No scripts were extracted, but the heuristic firings strongly indicate a malicious redirector. The ML classifier also flagged this PDF with high confidence.

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=all+falls+down+piano+sheet+pdf
    • http://files.hedcut.com/uploads/1/3/1/3/131384636/3870566.pdf
    • http://files.michellejohnsonhowell.com/uploads/1/3/1/8/131860378/mupeneretegiko.pdf
    • http://files.heretohealthwellnessclinic.com/uploads/1/3/1/0/131070651/xebenafakub_lelababunuxigu_dizeluvegazu_mamuziwewan.pdf
    • http://files.arnprioranimalhospital.ca/uploads/1/3/1/4/131453401/225047.pdf
    • http://puvix.hawksquadron.nhcapcadets.org/uploads/1/3/0/7/130775350/55bde.pdf
    • https://cdn.shopify.com/s/files/1/0429/2630/9535/files/23370394009.pdf
    • https://cdn.shopify.com/s/files/1/0429/1464/4127/files/bafasupowobigagawaxetiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/90282573276.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9030/files/how_to_stop_mac_from_sleeping.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.pdf
    • https://cdn.shopify.com/s/files/1/0451/8638/4023/files/abnormal_psychology_test_bank.pdf
    • https://cdn.shopify.com/s/files/1/0430/9290/2039/files/garufogenidesi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4716/3806/files/24960953206.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/rabubezipaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0433/0641/8331/files/upcoming_bank_exams_2020_20_full_list.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_off00004f6f.bin
79605410841a340613cf365e5fd6fb033d623790e93447ef8507c2e8bade0511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F6F 5116 bytes
font_01_sfnt_off000060e1.bin
242fe42d414a6ae21494be752086cea71ac733bb8b8ca4b7ecc3c0cacba87da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E1 14232 bytes

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