Malicious PDF — malware analysis report

Static analysis result for SHA-256 e251f4bcb2f2d052…

MALICIOUS

PDF

58.1 KB Created: 2020-08-19 21:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c05ee62748098f2e0cc6772fb0c7e388 SHA-1: 437a9e84a4f0b0e67d64d0124f4bcdd0ba1c8b12 SHA-256: e251f4bcb2f2d052fe584b55ea98023a0fba94c6cc29536373ffd26f4dcecb9e
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.ru/pify?keyword=anamnesis+pdf+concepto', suggesting a lure to a malicious site. The presence of a link farm further indicates an attempt to distribute malicious content or traffic. No scripts were extracted, limiting the analysis of direct execution capabilities.

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=anamnesis+pdf+concepto
    • http://rodetin.victorygamers.org/uploads/1/3/1/4/131407945/ff188514fe098ed.pdf
    • http://files.kaleenacarter.com/uploads/1/3/2/6/132695451/betan_sixobelavogo_zizipudarudogu.pdf
    • http://files.stevebirdart.com/uploads/1/3/1/4/131406321/pewemafizusular_gobitu_tunemaz.pdf
    • http://files.bestcarpetcleaningdavenport.com/uploads/1/3/2/6/132682723/xoxipot.pdf
    • http://files.kneadedsolacemassage.com/uploads/1/3/0/7/130739826/6c215a4f7a.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/wobakupopajas.pdf
    • https://cdn.shopify.com/s/files/1/0430/2766/0951/files/perimeter_and_area_of_triangles_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/6372/9557/files/sobep.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9319/files/battle_run_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/java_http_get.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/vubitiruzivukosabulofegil.pdf
    • https://cdn.shopify.com/s/files/1/0434/5669/2390/files/estudios_atacameos.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/kapezoxuxulolavekuwuwed.pdf
    • https://cdn.shopify.com/s/files/1/0437/3407/3505/files/96786821418.pdf
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/reset_tcp_ip_stack.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/wavowigudojasiso.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3155/files/office_administrative_assistant_resume.pdf
    • https://cdn.shopify.com/s/files/1/0440/2210/4222/files/xapajavijegogodajubawame.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_off00009667.bin
25f5476114ee47e49b35da405fb5746b0a6c70858eb0e1903d9b0052bf3a5e8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9667 5160 bytes
font_01_sfnt_off0000a7db.bin
ad592380d85971c4845c4d5fffa83a3abab21a6f93f7b9993a88ff27f521d308
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7DB 17168 bytes