Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdbfe6fb54fa77a…

MALICIOUS

PDF

41.5 KB Created: 2020-08-13 03:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b397f2b65e94ec6ed81004233a43ca51 SHA-1: 66a0ad0867284e6700f5228dfe5313ba7e500c12 SHA-256: dcdbfe6fb54fa77a3ccef3e4b7a7b0c02e3f0967c17bc2e02d7ebd98952e1f9d
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The embedded URL 'https://ttraff.ru/pify?keyword=strona+bierna+angielski+zadania+pdf' is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a lure to external content. No scripts were extracted from this sample.

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=strona+bierna+angielski+zadania+pdf
    • http://files.nabcgolfevent.org/uploads/1/3/1/4/131409128/pulufapul.pdf
    • http://bibosume.promisewed.com/uploads/1/3/2/8/132816066/e5ab4b.pdf
    • http://files.afinoentertainment.com/uploads/1/3/0/7/130739996/51ae93f12f5.pdf
    • https://cdn.shopify.com/s/files/1/0449/1198/4795/files/ernest_shackleton_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8206/files/kepadufananoxipekokafasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lurexemip.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/stock_market_basics_for_beginners_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8500/3926/files/surgical_cases_for_medical_students.pdf
    • https://cdn.shopify.com/s/files/1/0428/3482/1287/files/nadisuforipixiderile.pdf
    • https://cdn.shopify.com/s/files/1/0444/3258/8966/files/agnus_day_partitura_piano.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/53043906772.pdf
    • https://cdn.shopify.com/s/files/1/0437/7912/9501/files/bexugulotenodo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/loxutiwijadewafulon.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/faxenidupilogixezidesofaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/reznor_garage_heater.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/
    • https://cdn.shopify.com/s/files/1/0444/3258/8966/files/agnus

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000603e.bin
14b9fb9b7cb8ea9d3a2d7f1f3da51b704da2e5331427d3fbc7508dbd3765605e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x603E 5564 bytes
font_01_sfnt_off00007337.bin
7952fa2f91b3501e65f1a13e8673ebf73fbec28d9f6b7837fa8594248cb8b12f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7337 11432 bytes

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