Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64223f6538ad569…

MALICIOUS

PDF

41.3 KB Created: 2020-08-15 04:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ef8fb5a79ef4f292f70f75af5860e36 SHA-1: 5518cb3a8f5a81d381915622bf5228d432766f1b SHA-256: f64223f6538ad5691a111e591a117f2c45bc9e13586a3ef4c2073a37bd5bfc4c
152 Risk Score

Malware Insights

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

This PDF document contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=coverkids+income+guidelines+2017'. The document body also contains this URL, suggesting it is the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, many hosted on Shopify. The ML classifier strongly supports the malicious verdict.

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=coverkids+income+guidelines+2017
    • http://files.amysscubaconnection.com/uploads/1/3/0/9/130969459/milobaniwinuf-gijexokib.pdf
    • http://files.mayostudent.com/uploads/1/3/1/6/131606227/bisorawejeno.pdf
    • https://cdn.shopify.com/s/files/1/0431/2147/5738/files/anatomy_and_physiology_quiz_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8327/files/command_prompt_reference.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4832/files/36198792213.pdf
    • https://cdn.shopify.com/s/files/1/0437/0389/4171/files/sovejemedafope.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/42080787993.pdf
    • https://cdn.shopify.com/s/files/1/0437/8977/9106/files/94963371120.pdf
    • https://cdn.shopify.com/s/files/1/0432/2610/3971/files/wonepubijavekawuvu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4976/0406/files/golden_dawn_tarot_deck.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/36596039275.pdf
    • https://cdn.shopify.com/s/files/1/0429/8106/4853/files/.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_off0000613a.bin
bfe06d09bdee80d8e74fb1d4f36e02580209037d74f88d13e03ed8354efdada8
pdf-font-stream PDF embedded font (sfnt) at offset 0x613A 5484 bytes
font_01_sfnt_off000073e6.bin
067c3887f4190df1536f83c902d709ec22c669790d870a97ced79f7e7a2f9c80
pdf-font-stream PDF embedded font (sfnt) at offset 0x73E6 10800 bytes