Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b737579e75716a6…

MALICIOUS

PDF

34.9 KB Created: 2020-08-12 18:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 123b312cdd6b462e49e7929fc70a76d6 SHA-1: c49c3082a9cdbf576c4e00c4ac8325e2e3bb208d SHA-256: 7b737579e75716a69b29bdffdfc47cfc31bf85a459c59ee774d91be48b000636
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm for SEO manipulation or to distribute further malicious content, leveraging the 'ttraff.ru' redirector.

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=apostrophe+practice+pdf
    • http://xuzij.proceng.co.uk/uploads/1/3/0/7/130740496/tobewi_dazaf_dalabinifetubo_pedamekanatem.pdf
    • http://bigumof.kamiza.com/uploads/1/3/2/7/132710621/pesafop.pdf
    • http://files.tomfosterclippers.com/uploads/1/3/1/4/131453541/novilorul-punok.pdf
    • http://maroku.forlianofarm.com/uploads/1/3/0/8/130814297/jivutoxepukinux.pdf
    • https://cdn.shopify.com/s/files/1/0438/9827/3944/files/17729541969.pdf
    • https://cdn.shopify.com/s/files/1/0434/7779/4982/files/programa_arquitectonico_restaurante.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/learning_php_the_hard_way.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/56553735199.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66656561998.pdf
    • https://cdn.shopify.com/s/files/1/0434/4440/4374/files/yoga_for_back_pain_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7495/files/janusonumuruzi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3152232763.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/first_law_of_thermodynamics_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/36863100500.pdf
    • https://cdn.shopify.com/s/files/1/0431/6148/5471/files/95314539839.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_off00004b5a.bin
5e338e84dcf07348dbc350d5c974d50dc906c4e8b642255e26bf83087fa6d8b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B5A 5200 bytes
font_01_sfnt_off00005d00.bin
e2271fce79355b2b915b6eb169ef43c3ae7009cef361fda176725a65b013ee79
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D00 10032 bytes