Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8fa7e4dfcd9b7e…

MALICIOUS

PDF

44.6 KB Created: 2020-08-24 13:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a058ad42d60ef310ece4c6e2b354c194 SHA-1: afcdf379281dc3e8244032230fc365e2fbbb137b SHA-256: 1c8fa7e4dfcd9b7e7d7b621bd2903e3b29fc4375f637ebf8cb7ad51dad32e777
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or SEO abuse tactic. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=asthma+pathophysiology+and+treatment+pdf', is identified as a known malicious redirector. The document body contains garbled text but includes the same URL, reinforcing its malicious nature. The primary attack pattern appears to be luring users to malicious infrastructure through a deceptive link.

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/pify?keyword=asthma+pathophysiology+and+treatment+pdf
    • http://forazox.championschoicecamps.com/uploads/1/3/2/6/132681670/vokobef.pdf
    • http://kijono.indesignz.us/uploads/1/3/1/6/131637016/tinolomisekub_sijukologotimu.pdf
    • http://wazigipu.raisinhealthinternational.com/uploads/1/3/1/3/131380005/fevedo.pdf
    • http://zagenumez.lisaruth.net/uploads/1/3/1/0/131070588/eabc5cf75dc56.pdf
    • https://cdn.shopify.com/s/files/1/0435/2091/7668/files/avengers_4_tamil_movie_full.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/pizekezatenip.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/18824686975.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/18602200230.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/up_b._ed_entrance_exam_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/3171/4202/files/35660702955.pdf
    • https://cdn.shopify.com/s/files/1/0431/0695/9514/files/bank_statement_generator.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/dotirajonowozowubotux.pdf
    • https://cdn.shopify.com/s/files/1/0437/3849/7185/files/muxulepaganinajuku.pdf
    • https://cdn.shopify.com/s/files/1/0449/6012/0991/files/grammarly_app_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/iso_9001_audit_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/81511163949.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/american_english_vs_british_english_spelling_differences.pdf
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/12346775186.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_off00007117.bin
38bb4cf81bf31cef791e4d0c28bb479189aea6684fb39057ed3728e375df7a23
pdf-font-stream PDF embedded font (sfnt) at offset 0x7117 5544 bytes
font_01_sfnt_off000083cc.bin
8fdbbf49e301604960052b7ce1ab966808a4cd67111b0f7f49d1973ab75db5c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x83CC 9740 bytes