Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cff345b52141fb6…

MALICIOUS

PDF

43.1 KB Created: 2020-08-23 14:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df9d0cc2564322147f346682cfcee997 SHA-1: 073ad0d6ec68ccad7fa05b7557d4e3e73c5f2778 SHA-256: 0cff345b52141fb61f294901edeb924bfee33b71d0385df53e13e49d4e0690fe
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or SEO link farms, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'meme creator pro apk'. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves directing users to external, potentially harmful websites.

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=meme+creator+pro+apk
    • http://files.brockportcentralptsa.org/uploads/1/3/1/4/131453990/nixuwazu.pdf
    • http://tidowij.jonathanrudy.com/uploads/1/3/1/8/131857152/3326981.pdf
    • http://xodoto.worldvegantravel.com/uploads/1/3/0/7/130739777/f6de01704f3635.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/total_conquest_hack_mod_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/mulemexiveroxepoxoxesuna.pdf
    • https://cdn.shopify.com/s/files/1/0438/8179/1643/files/34311869666.pdf
    • https://cdn.shopify.com/s/files/1/0432/0077/4308/files/alter_ego_a1_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/8624/1189/files/koges.pdf
    • https://cdn.shopify.com/s/files/1/0428/7807/5036/files/54127863415.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/89079337334.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/sakalufixorul.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/welavetipulesibowufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65022979336.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/8375347409.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bebupikisanomagidilu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/48490223274.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/27977021377.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_off00006a5b.bin
20296eacbae58c927ecd0aceda073c41246de248cb4140b873fac72b094df171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5B 4940 bytes
font_01_sfnt_off00007b17.bin
e76d197da6127183ee3ed4b6fc81d1c0079d1053578c10b6f15b4898c8f5a038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B17 10640 bytes

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