Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f5a6ef228d862d…

MALICIOUS

PDF

72.7 KB Created: 2020-08-06 10:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 320b4b4561daf3914bc9980a798f17a7 SHA-1: a1d57df303e1ce24b66c726a7ba0f68b6ea88336 SHA-256: b2f5a6ef228d862d52d8641ca79cc86649249cef3e893ce1825633569d7ffc5a
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.com', identified as a malicious redirector. This link is presented as a 'Bukowski poetry pdf' lure, suggesting a social engineering tactic to entice users into clicking. The PDF also hosts a large number of external links, many pointing to Shopify domains, likely part of a link farm to improve search engine ranking 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.com/pify?keyword=bukowski+poetry+pdf
    • http://files.waterselementary.org/uploads/1/3/0/7/130739393/0847e5683b13.pdf
    • http://files.haleykatharine.com/uploads/1/3/1/4/131407424/surawojamo_nukobuwumova_botimutin_jadipu.pdf
    • http://files.swesdsu.org/uploads/1/3/0/7/130775825/5315908.pdf
    • http://files.diamondlfeedandtransport.com/uploads/1/3/0/9/130968967/jaredar_sokebigadoki_kadudezu.pdf
    • http://files.priestrivercommunitychurch.org/uploads/1/3/0/7/130775017/0d32544cb6.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/wosaxude.pdf
    • https://cdn.shopify.com/s/files/1/0438/4079/8885/files/mefovebitebixubilotego.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5329/files/favekadugadamisup.pdf
    • https://cdn.shopify.com/s/files/1/0432/4553/5400/files/62258783791.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4826/files/29662147980.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/66746830052.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/lifirubiziwufos.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/calmar_ratio.pdf
    • https://cdn.shopify.com/s/files/1/0438/0593/3730/files/job_interview_conversation_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/6960/4001/files/94362611060.pdf
    • https://cdn.shopify.com/s/files/1/0432/8452/9310/files/2573306456.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_off0000d3f5.bin
6d3258907a3f966c1a4a87f781f7edc3aefed2d1a45c64fb07d682724a4c3195
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 5100 bytes
font_01_sfnt_off0000e582.bin
d648b025508bab9af5929ec620da774949a7fe06259e8e45f6a71b5fc9cd5491
pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 15520 bytes