Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb163db45ab00f62…

MALICIOUS

PDF

47.7 KB Created: 2020-08-06 20:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b614c0e97926c23e80559f18dea2ef7 SHA-1: 9a68e04cb2f2a53e50542f9ad835f4cbf5fd6d9b SHA-256: bb163db45ab00f625903a8af8c3c0d66c624b9e98cfea5fa88baeafb9eaede7f
154 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a malicious domain, disguised as a cheat sheet. The ML classifier strongly indicates maliciousness. The document body contains obfuscated text and multiple embedded URLs, including the primary malicious redirector and a large number of Shopify links, likely part of a link farm. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a phishing or redirection attack.

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.com/pify?keyword=design+patterns+c+cheat+sheet+pdf
    • http://talul.bekindtoeverykind.com/uploads/1/3/1/4/131408024/7935704.pdf
    • http://files.zoza.co.uk/uploads/1/3/1/4/131437308/9516992.pdf
    • http://files.jackblairgray.com/uploads/1/3/1/3/131384018/eede518175.pdf
    • http://files.kineticaussies.com/uploads/1/3/2/6/132681698/3291697.pdf
    • https://cdn.shopify.com/s/files/1/0431/2730/8454/files/kenor.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/76087239037.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/56799716977.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/logodolajiniwigebuzapo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3844/8548/files/minecraft_0._13._0_servers.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/fofilixamokanasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3279/6574/files/roman_workbench.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/12657941624.pdf
    • https://cdn.shopify.com/s/files/1/0434/3968/5799/files/85033947597.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/vapoxamipatuzewexob.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/79997805571.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_off00007e66.bin
c2a3d4aeacdc7dff4d764db41382996942fcb8680077d9e9be2dc78f84565b1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E66 5384 bytes
font_01_sfnt_off000090b3.bin
75835ddb4c9f7d249ad29433bb10052489db9dfdada6165e49fc018b5483db20
pdf-font-stream PDF embedded font (sfnt) at offset 0x90B3 9720 bytes