Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d79e9260e24a12e…

MALICIOUS

PDF

41.3 KB Created: 2020-08-24 07:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fcc00ce5f86a04126b10d82527928d9 SHA-1: 2645df931018cd9f632b7e55cc8fa72e2dcbe62f SHA-256: 5d79e9260e24a12e63ffb90690af2471e531e9336527f1684f91f583110ebb9d
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting an 'informative bulletin' lure, aligning with the 'SE_INVOICE_LURE' heuristic. The presence of many Shopify-hosted PDF links suggests a link farm used for SEO poisoning or distributing malicious content, with the primary malicious link pointing to ttraff.ru.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=boletin+informativo+afpnet
    • http://files.hairandmakeupcompany.co.uk/uploads/1/3/1/4/131406807/b9d80ccb78483.pdf
    • http://files.pontyclunchiropractor.co.uk/uploads/1/3/0/7/130738752/b51169b1b530.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/minumexikojej.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7554/files/78129812749.pdf
    • https://cdn.shopify.com/s/files/1/0465/2865/9614/files/tazapejejovu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/vubonogomom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigorekotat.pdf
    • https://cdn.shopify.com/s/files/1/0431/4038/2882/files/5221524562.pdf
    • https://cdn.shopify.com/s/files/1/0447/3192/4629/files/how_to_ping_lol.pdf
    • https://cdn.shopify.com/s/files/1/0435/6086/1845/files/situbilijomeni.pdf
    • https://cdn.shopify.com/s/files/1/0430/7048/8730/files/72432040270.pdf
    • https://cdn.shopify.com/s/files/1/0440/8147/9832/files/wovorifulimuratamarod.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5481/files/best_text_editor_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/9889/7574/files/fideveluvorebedes.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_off0000653d.bin
0fc9425badb133e8b4304458dbce91ad9acd6674a354ac365c2c013ff475e02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653D 4976 bytes
font_01_sfnt_off00007617.bin
36b202f989b2441f203611b9476d8edcdd1dd5a5b4eead0e4fda418b42532966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7617 10152 bytes

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