Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8f267373f3e95a…

MALICIOUS

PDF

41.4 KB Created: 2020-08-24 11:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2c286af260422a365e6f34fc6d917b0 SHA-1: d871a7a9988e3fb82d27661645246cf3dfbd12c5 SHA-256: 3d8f267373f3e95a6a5d96f15b5c122634b50c4e56af4e1a1affdec7663186a2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as an employee recommendation letter. The link leads to 'ttraff.cc', which is known for redirecting to malicious content. The document also exhibits characteristics of a link farm, with numerous embedded links pointing to external PDFs, likely to improve search engine ranking for malicious lures. No scripts were extracted, but the primary attack vector is the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=employee+recommendation+letter+sample+from+employer+pdf
    • http://files.circamodern.net/uploads/1/3/2/6/132681192/sagidigepamax.pdf
    • http://files.fionamatisse.com/uploads/1/3/0/8/130813546/fbd7e283d49.pdf
    • http://files.itgpodcast.com/uploads/1/3/0/7/130739419/gasugop-rokezidux-xojasit.pdf
    • http://files.yuweifoodtrading.com/uploads/1/3/0/8/130874354/vugepowiwesanemeru.pdf
    • https://cdn.shopify.com/s/files/1/0445/5255/2612/files/zuxikopis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3131/4077/files/dekobemodevabazifaluribeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/duwusurenawetadosoki.pdf
    • https://cdn.shopify.com/s/files/1/0437/5163/7141/files/48126185621.pdf
    • https://cdn.shopify.com/s/files/1/0431/9202/5249/files/vuzibibepere.pdf
    • https://cdn.shopify.com/s/files/1/0434/0491/8941/files/patitorarirulo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9996/3044/files/sexapejilukekisa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1520/1191/files/xejuzafeko.pdf
    • https://cdn.shopify.com/s/files/1/0430/8634/8450/files/lumoxuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/9511/2347/files/6905575356.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/88310303494.pdf
    • https://cdn.shopify.com/s/files/1/0429/3070/0455/files/vikugadetolapozazivaja.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_off0000645d.bin
3c687fb9b2cf0e6e9aaf37bf16c801ddbd555dc0bacc78c23cfa56147a98fb0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645D 5360 bytes
font_01_sfnt_off00007687.bin
3ef19d35cba2e0724904dd4711948d566d46f3b69d83f68965832c500a4f86ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7687 9944 bytes

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