Malicious PDF — malware analysis report

Static analysis result for SHA-256 693bc3ab5d7cff77…

MALICIOUS

PDF

57.2 KB Created: 2020-08-19 21:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f59856b322cf38b286ac604f22d9cf60 SHA-1: 7099235b39de00d0d91006c7f7a3c3ff0f1187ab SHA-256: 693bc3ab5d7cff77d37f27e5d7c901ba89724329f9c40923380f058f851d7174
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is flagged as malicious. The document body, though heavily obfuscated, contains the same malicious URL. The PDF also hosts a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicates maliciousness.

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=bluetooth++windows+7+microsoft
    • http://files.backpackingstories.com/uploads/1/3/1/4/131407012/7577899.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2261/3655/files/class_bacillariophyceae.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/fakibo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/zaziwovadagejonekipep.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/48192865148.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/20247879999.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/vajujuwuni.pdf
    • https://cdn.shopify.com/s/files/1/0432/2679/2100/files/6863484986.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dipudakafadaned.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/application_format_file.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_off0000a2b9.bin
48025c2381d653470de855808ec239e1888e97b377fd762e686156b60bc84831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B9 5272 bytes
font_01_sfnt_off0000b493.bin
1def960942a791b979475b067c1bad2cff0e637d51aa43905a5c52823e7eb335		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB493 10328 bytes

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