Malicious PDF — malware analysis report

Static analysis result for SHA-256 85522a174b54b186…

MALICIOUS

PDF

65.4 KB Created: 2020-08-27 16:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9966c591e6cab39da982ce4d0336013c SHA-1: d5c6e6d4bb474d05336d3d26f17fce3c7447ddc3 SHA-256: 85522a174b54b1860c0a1ac8900b25014ee6e6ba07d4f902be658e9e7d36a020
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', which then leads to a link farm of 22 PDF files. Another heuristic indicates a password-protected archive lure, suggesting the PDF is a decoy to facilitate the download of a separate malicious payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.com/pify?keyword=patrones+de+conocimiento+de+barbara
    • http://files.citrusandmintdesigns.com/uploads/1/3/1/4/131453348/4722192.pdf
    • http://levaf.definitivearts.net/uploads/1/3/2/6/132680981/fezujijuziwaxuz-jidajepisarira-fawij-xowitamenako.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8980/3941/files/zawizewebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7287/1832/files/4005164949.pdf
    • https://cdn.shopify.com/s/files/1/0437/9528/4130/files/59627890454.pdf
    • https://cdn.shopify.com/s/files/1/0430/7818/9205/files/datakubuzolixuli.pdf
    • https://cdn.shopify.com/s/files/1/0430/7828/7521/files/livojeti.pdf
    • https://cdn.shopify.com/s/files/1/0437/8673/1681/files/pexilikuvesevozorigete.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/84577039546.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9453/files/juruxelamo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1592/0024/files/punusegowuroniru.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_off0000bfb3.bin
4c9ce933da6c6815796e956359a9e910918ec18c98d1d5ecb88e7bb6de8fbacf
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB3 5192 bytes
font_01_sfnt_off0000d13b.bin
5673afee674f068036a480a63be6afd7ab3b13f2c273956c2e95d50a0726dada
pdf-font-stream PDF embedded font (sfnt) at offset 0xD13B 11660 bytes