Malicious PDF — malware analysis report

Static analysis result for SHA-256 7655fe3561d9d957…

MALICIOUS

PDF

41.1 KB Created: 2020-09-04 14:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eee9adacec20c91e0ad61e10ade8814 SHA-1: e1e1e9d489646f22cef82d10573a837b17275558 SHA-256: 7655fe3561d9d957421ff2929cc59fe2922367a25ae3b883c3019e7d605924d3
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/pify?keyword=gcse+physics+equation+sheet+ocr', which is flagged as malicious. The presence of numerous other PDF links suggests an attempt to create a link farm or distribute further malicious content. The ML classifier strongly indicated 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.club/pify?keyword=gcse+physics+equation+sheet+ocr
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/8937/4887/files/migum.pdf
    • https://cdn.shopify.com/s/files/1/0462/5370/3317/files/categorization_worksheets_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/borubixisob.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/74936639993.pdf
    • https://static.usrfiles.com/ugd/ea78e0_21b6572a89ab4851b98d2f750d471484.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/mokifaragepuzegepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4833/files/final_fantasy_9_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/29578959305.pdf
    • https://cdn.shopify.com/s/files/1/0439/2806/0059/files/betotivetepomazomef.pdf
    • https://cdn.shopify.com/s/files/1/0448/4536/7453/files/bookmark_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/business_intelligence_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/82102909888.pdf
    • https://cdn.shopify.com/s/files/1/0438/8893/5067/files/pusejezituretadafosezodo.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_off00006372.bin
b1287d98cc0dfaf4e4fb22dd919c59e56ba62e2c43c6fab7c0c057379878df9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6372 5248 bytes
font_01_sfnt_off00007557.bin
5efb4e390ed3bce4a1bd429d8d6cf9d3cbc5c0e23b5ec150520bf00131a2353b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7557 10112 bytes