Malicious PDF — malware analysis report

Static analysis result for SHA-256 1225200d0e2309ea…

MALICIOUS

PDF

39.3 KB Created: 2020-08-12 20:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 981df8bb9719287de32624747f0de930 SHA-1: 7831425fcda251259ab5fe2d68f5b569b592dd94 SHA-256: 1225200d0e2309ea1102950725a816482192bda24ddbd58e68dcb06accd4ed35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at `ttraff.com`. The heuristic firings indicate a link farm designed to redirect users, likely to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=les%20principes%20comptables%20fondamentaux%20marocain%20pdf
    • http://losiwipet.slhschoirs.com/uploads/1/3/1/6/131607029/8e5dd3cb3.pdf
    • http://files.rachellynnspeaks.com/uploads/1/3/0/8/130814284/dolidirifewokaxeb.pdf
    • http://files.otterworksusa.com/uploads/1/3/1/4/131437351/tasegus-rekafi-zeganusisaj-jigavulef.pdf
    • http://files.teamhighlightreel.com/uploads/1/3/1/8/131871909/lagavave.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0753/1414/files/tefaroropuvube.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/vofuno.pdf
    • https://cdn.shopify.com/s/files/1/0434/5430/0312/files/straddle_milling.pdf
    • https://cdn.shopify.com/s/files/1/0435/5702/8001/files/38152026896.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4615/files/jifizuzaninogimoze.pdf
    • https://cdn.shopify.com/s/files/1/0440/7354/9974/files/32685257298.pdf
    • https://cdn.shopify.com/s/files/1/0437/5897/7178/files/981795646.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38664456414.pdf
    • https://cdn.shopify.com/s/files/1/0446/6917/3923/files/paul_bunyan_communications_webmail.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/70620227940.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9671/files/sagomovilus.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ac8.bin
61a759d2cb9dba8e9ee16a81a4c9ce33f687417305b38d3fe9884374d10e7e23
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC8 5448 bytes
font_01_sfnt_off00006d34.bin
c153e24f420d00b3dcc43ce3f1701f2b8f79b0c720b0f065ed44e8c46e9a97a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D34 10500 bytes