Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff491973dcc8b113…

MALICIOUS

PDF

80.7 KB Created: 2020-07-08 13:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b24ffcf48768d0c6107434708573335e SHA-1: 0fbb4034b03c6131e1bc00434bf6819b48dc4a32 SHA-256: ff491973dcc8b113c56e1dded3ea6a7d77e45906662fe0c75d5acb23f5ae2257
150 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains numerous links to external PDF files, indicating a link farm for SEO manipulation. One of the embedded links, https://ttraff.ru/wb?keyword=human%20resources%20management%20in%20canada%20thirteenth%20canadian%20edition%20pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains similar keywords and URLs, suggesting a lure to a malicious site.

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.ru/wb?keyword=human%20resources%20management%20in%20canada%20thirteenth%20canadian%20edition%20pdf
    • http://files.sproutsmyanmar.com/uploads/1/3/2/3/132302863/giburapudiga-dojowul.pdf
    • http://files.hordlevoluntarycare.org/uploads/1/3/0/8/130874413/zoladamalija.pdf
    • http://files.wunetserve.com/uploads/1/3/2/6/132696263/tezubetezegeto.pdf
    • http://files.easternsloperanch.com/uploads/1/3/2/6/132681404/3588728.pdf
    • http://files.mrsmljohnson.com/uploads/1/3/1/8/131871648/nisitatovik.pdf
    • http://files.pennjournalconlaw.com/uploads/1/3/2/6/132682694/bawibixijuzawo.pdf
    • https://vubajalol636514693.files.wordpress.com/2020/06/gilus.pdf
    • https://pimudan.files.wordpress.com/2020/06/vokotugezefufosipo.pdf
    • https://xowagibiwu.files.wordpress.com/2020/06/xajalirefo.pdf
    • https://virebon.files.wordpress.com/2020/06/2447868737.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e221.bin
e0a17fe7a0302ae76d8283a236b63f0075a03375efc9370c86bcd5108eda1260		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 5380 bytes
font_01_sfnt_off0000f436.bin
42ac2ab2b2f0a5cb9cb0d8abe6ab695fce482052f02fe78149ae45f25b294118		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 13624 bytes
font_02_sfnt_off0001203a.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 16204 bytes

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