Malicious PDF — malware analysis report

Static analysis result for SHA-256 131d9c7b3a2a7c74…

MALICIOUS

PDF

47.6 KB Created: 2020-08-10 09:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15a34ff333d215e1a38b3595cc2fea4d SHA-1: f2a1b1678ea621cba8f4a7d3765929474046ffa3 SHA-256: 131d9c7b3a2a7c7473c60d250a0f8088644f5f3231a098edc9c5680a48c4217a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous links, one of which, 'https://ttraff.ru/pify?keyword=all+articles+of+the+constitution+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=all+articles+of+the+constitution+pdf
    • http://namusig.enonbaptistgilmer.com/uploads/1/3/1/6/131637814/fagovi.pdf
    • http://files.videoevent.co.uk/uploads/1/3/1/4/131452733/eb9cd4cb81aeaa.pdf
    • http://files.abbeypsychservices.com/uploads/1/3/1/3/131380045/feniz-zupuwuj-lukatu-taxagomo.pdf
    • http://files.newportboysnationalschool.ie/uploads/1/3/1/3/131381919/tamot-rufolak-kawazil-zivegajebofow.pdf
    • http://files.rtwtus.org/uploads/1/3/0/7/130739443/veviw-fedelam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32867625585.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3215656586.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/71028824608.pdf
    • https://cdn.shopify.com/s/files/1/0441/2165/3400/files/tepesuwaxanikerubiketixu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2515/files/76994850743.pdf
    • https://cdn.shopify.com/s/files/1/0428/9213/2508/files/tewerosebitamotibum.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/domingo_garcia_belaunde.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7649/files/93446965439.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/super_metroid_ju_rom.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2966/files/526074232.pdf
    • https://cdn.shopify.com/s/files/1/0434/5895/3369/files/todopikodaguguliguza.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e56.bin
2bc698b51ee9aff83d85f4ef44fca9aa02cedf37243a1a879c015be3a40492c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E56 5232 bytes
font_01_sfnt_off0000901f.bin
652962f3d7a4e084f9b416999cf58fc22e4c201b1508eba84a3336e4b0053c41
pdf-font-stream PDF embedded font (sfnt) at offset 0x901F 9728 bytes