Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a207d4d9c458f0…

MALICIOUS

PDF

41.2 KB Created: 2020-08-03 09:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5fb5c7edeb6d5203e766716729d0027 SHA-1: 9ca3f89c0413af5778ce76ea98dc8a9b8148c825 SHA-256: 57a207d4d9c458f0871a47b3b68915673d2e60194cdeb09489db986a5260753b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, a PDF SEO link farm heuristic indicates the document is designed to host numerous external links. The document body, though heavily obfuscated, contains the same URL. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's a lure for malicious content.

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=bb+apps+world+download
    • http://files.cacmath.org/uploads/1/3/1/1/131163687/bopijufefobevut.pdf
    • http://files.kingdommassage.net/uploads/1/3/1/4/131407178/bisini_sebib_xopugoxedega.pdf
    • http://files.pflagprovidence.org/uploads/1/3/1/6/131637307/0babb158cb72a6.pdf
    • https://cdn.shopify.com/s/files/1/0431/2501/4685/files/divowazo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0282/9734/files/49547742941.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6564/files/juvisamuribebena.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/97488128402.pdf
    • https://cdn.shopify.com/s/files/1/0437/5992/7448/files/40279626444.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/95047226988.pdf
    • https://cdn.shopify.com/s/files/1/0431/2504/7463/files/49436866180.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8730/files/nugewurajuvedabogaxin.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/74087528566.pdf
    • https://cdn.shopify.com/s/files/1/0435/4395/3567/files/sanediwa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5063/8241/files/22582097922.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/juzizi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/jesumeposaguwa.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_off00006431.bin
c8303eaae736644ee105b4279fa97da69fdcede4b5198d13305e2cb6db6e61d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6431 5236 bytes
font_01_sfnt_off00007619.bin
2cc635bfe21b67d7f8e4f35c03cffade8bb7d912a5a3a72ee3673ab3b44d2331
pdf-font-stream PDF embedded font (sfnt) at offset 0x7619 9884 bytes