Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cac962faca26f34…

MALICIOUS

PDF

40.2 KB Created: 2020-08-03 00:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0825f87bf38cd889cc1b2a511106b0b7 SHA-1: a31e52914d2deae4c859772cb50bda3ff822483e SHA-256: 3cac962faca26f346d3dae84880ee53aa37ac2e54772009d9fd0a898cea8bb22
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, many of which point to potentially malicious redirectors or SEO farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of numerous links suggests an attempt to lure users to external, potentially harmful, 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.cc/pify?keyword=troy+bilt+super+bronco+tiller
    • http://files.bklnmanners.com/uploads/1/3/1/6/131606186/dawekolileguxusotuso.pdf
    • http://files.triviumtriathlon.co.za/uploads/1/3/1/1/131163927/boxaxevirotiwe_pemugefekige_luzib.pdf
    • http://files.sagehillstables.com/uploads/1/3/1/0/131071231/wowuned_mixorebuj_zomot_tabokilunuga.pdf
    • http://files.nbiforage.com/uploads/1/3/0/7/130775462/6b5750ae712.pdf
    • https://cdn.shopify.com/s/files/1/0432/6483/5737/files/92726452167.pdf
    • https://cdn.shopify.com/s/files/1/0439/2851/8824/files/34._432_118._426.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/tejuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/48638732338.pdf
    • https://cdn.shopify.com/s/files/1/0428/9583/5295/files/jujaxosikixozovidagizipiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/4091/3046/files/jibarujotufim.pdf
    • https://cdn.shopify.com/s/files/1/0430/8792/1313/files/60409543448.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/recursion_in_mips.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8916/files/raised_eyebrow_emoji_text.pdf
    • https://cdn.shopify.com/s/files/1/0436/3694/9152/files/ps_form_3189.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/12876987891.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_off00005e2b.bin
1ad1b3e604b8e29f5811e25a74c40da830d191f1980409dc0b072abfdebf20d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2B 4908 bytes
font_01_sfnt_off00006ef4.bin
731244be8b42881c40903666a554b5308bab5c914fe77d775b0aaa534b6d715a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF4 10504 bytes