Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9da8c753dab5e6e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-19 01:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26ad21a83c364e73b7e6a24f242c1532 SHA-1: f65f668bf2edc2080ba4eee8e5d0512e152535f6 SHA-256: c9da8c753dab5e6e630f4b1468928a4773f76dc92c7eb2210d384a5501014652
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate a PDF link farm designed to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users through these links, likely for phishing or malware delivery.

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=simple+past+form+of+arise
    • http://vuterop.beyondlagartococha.com/uploads/1/3/1/4/131410685/5530619.pdf
    • http://zixomisa.thecreativebusinessnetwork.com/uploads/1/3/0/8/130814328/napozatid.pdf
    • http://files.believersholinessconference.org/uploads/1/3/1/8/131856333/6235083.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/73770960722.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1256/files/mariah_boat_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4001/files/vawogal.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/cell_phone_jammer_application.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/28673764086.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/nakejazusokitulaxuvugu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8517/5713/files/77983449854.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/14648798768.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/50744427772.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_off00005ab0.bin
9b9bb26e510ed299e89d00c6e1456342288cf54815e06f1af364b928cbc5c167
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB0 5148 bytes
font_01_sfnt_off00006c15.bin
299281f7bf7b41f75cb9676ae4cd7b2068baa0fd9e256606252e9f56c46043b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C15 14444 bytes