Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f85355a14015c8f…

MALICIOUS

PDF

37.1 KB Created: 2020-08-09 03:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3919e4049af4709386d8041c21244c7 SHA-1: 4e31f3d4193bd831316d5a48f859d3bf50be4ffc SHA-256: 0f85355a14015c8f7d8e7f61a61ec8a973ccdb111025071f8ebad2301b982def
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. This suggests the document is designed to lure users to malicious websites, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness, supporting the assessment of a malicious redirector pattern.

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=file+pdf+to+jpg
    • http://files.kernefc.org/uploads/1/3/1/3/131398113/rirubagove.pdf
    • http://files.carolinejunkins.com/uploads/1/3/2/6/132682851/melotegok-toramitigof.pdf
    • http://kekugafo.kappasigmamu.com/uploads/1/3/0/7/130738799/84c68efbaf4562.pdf
    • http://files.winshipart.com/uploads/1/3/1/4/131437194/7510410.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2155/6117/files/23937513757.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sitomomuwarusubewikujo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/xaxut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9254/1589/files/vizio_tv_codes.pdf
    • https://cdn.shopify.com/s/files/1/0430/2084/5210/files/88963544492.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/pitaruravupobumipozumig.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/govejowexiwefexe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/baguminitojagomod.pdf
    • https://cdn.shopify.com/s/files/1/0432/0467/3697/files/86386576865.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_off000055fc.bin
c496863f1beedff5d114b89563d9638867faa5d9de386717323b8fe180c45380
pdf-font-stream PDF embedded font (sfnt) at offset 0x55FC 4756 bytes
font_01_sfnt_off00006652.bin
1e8af8ad1b32a26ee46fac86aa0c7d54da3adb96c3e158926b782d5300fafa70
pdf-font-stream PDF embedded font (sfnt) at offset 0x6652 9860 bytes