Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e82417749a335c9…

MALICIOUS

PDF

40.4 KB Created: 2020-07-30 21:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c9b9f8700f531e45c77412a5c8ab67 SHA-1: 0756272d121764d26a358e327ba5fcb29e2c2b89 SHA-256: 8e82417749a335c93c69906d57203274baffac481f20dcc905ac04b2efe67d41
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, a common tactic for redirecting users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to ttraff.ru, a known malicious redirector. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting an attempt to obscure the true destination or engage in SEO manipulation for malicious purposes. The ML classifier also strongly flagged this PDF as malicious.

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=geometrical+tolerances+book+pdf
    • http://files.bbcgibson.com/uploads/1/3/1/4/131406288/8550372.pdf
    • http://files.tymprojects.site/uploads/1/3/1/4/131453111/nosofaloguveta.pdf
    • http://files.iowarabbitrescue.org/uploads/1/3/1/6/131607110/76fba9e8e6.pdf
    • https://cdn.shopi
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fusuzirosaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/3161/5909/files/tudukuresipu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/58614123325.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3250/files/birepag.pdf
    • https://cdn.shopify.com/s/files/1/0434/9850/4354/files/zivagewevoxuxobisadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8347/2802/files/medupifunetinuvibilomode.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/75055853565.pdf
    • https://cdn.shopify.com/s/files/1/0439/0912/0152/files/61225967475.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/8509302142.pdf
    • https://cdn.shopify.com/s/files/1/0428/5241/7703/files/sadoponotilesugoposoxaru.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/90878965197.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_off00005fba.bin
abef6a7dfce2a518d3111b693d550c6f4de186720e815f08409aba88189388b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBA 5324 bytes
font_01_sfnt_off000071b5.bin
3134482657d4784d66f39bd020462c505b33ad079f57c703c4ad477c99e02bce
pdf-font-stream PDF embedded font (sfnt) at offset 0x71B5 10172 bytes