Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fdb0f51e1d3a8a…

MALICIOUS

PDF

37.7 KB Created: 2020-08-30 10:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 126ef4a470cdf4b6242306e0ced20b8b SHA-1: 6f12dd883ad0f778457552a4d7a6731ff9052ed9 SHA-256: 24fdb0f51e1d3a8a817e71813bd91265837f38514f375f6af23f23b7d838ea6a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.me'. Additionally, it exhibits a PDF link farm behavior, with numerous links to PDFs hosted on 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The primary intent appears to be SEO manipulation or redirection to malicious content, rather than direct payload delivery from this PDF itself.

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.me/wix?keyword=battery+for+acorn+180+stairlift
    • https://static.usrfiles.com/ugd/7c3584_7a2b5198af374b8f939b60bc01c9ec05.pdf
    • https://static.usrfiles.com/ugd/de3d83_d7e8a4b4b3ed4f21bc50f1e9287b59cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2d2d1ebdadc40988c370930e0a12958.pdf
    • https://static.usrfiles.com/ugd/c6ac46_2ae98e136c3f4755ac7217d890d9214b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f5505025d5b4854ab95cd8b73e34d04.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bec7bd20ef2441ba72da88219e6da27.pdf
    • https://static.usrfiles.com/ugd/6908d7_9743e80c585e49189a036885f46a64b3.pdf
    • https://static.usrfiles.com/ugd/0511f5_fc4cb98fa56a42d98dcee9de5832827a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7611be48a7a4df19e2892168bd938e0.pdf
    • https://static.usrfiles.com/ugd/f46427_ec51518c2c1141b6a73b4f261a3e8d52.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/ridulegobakudurorawav.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/zotomesamegaxizazanin.pdf
    • https://cdn.shopify.com/s/files/1/0447/8782/6854/files/91800972096.pdf
    • https://cdn.shopify.com/s/files/1/0429/3342/0195/files/gekaduruvinunivuxavid.pdf
    • https://cdn.shopify.com/s/files/1/0434/1137/4230/files/gopubanubugepinuvapem.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_off00005480.bin
81f628dec6270eed32a2259dffaef2381a123ca51dadecdb2b01730a53ee737a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5480 5416 bytes
font_01_sfnt_off00006704.bin
f272fc9193475e052c29b86fa0db678752b1ccc761feffe2f0c1d67b5ef978a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6704 10220 bytes