Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc0bb5b71b4aa89…

MALICIOUS

PDF

69.0 KB Created: 2020-08-05 08:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6ae51ed601895a795c197510ae0c5af SHA-1: 150931bcf1531c33a5a9d48ce12450341c345aaf SHA-256: 6fc0bb5b71b4aa894adcdca5216297efe4a9df8f3a090f6a9b34bb5618da6c78
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector, disguised as a bus timetable. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse. The primary malicious IOC is the redirector URL, which likely leads to further stages of infection.

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=x26+bus+timetable+pdf
    • http://files.hismun2020.com/uploads/1/3/1/3/131379971/pedutiwot.pdf
    • http://files.butterflycatalogs.com/uploads/1/3/0/8/130874514/magimozejulujo_wuwibefuvas_kejolaxanu.pdf
    • http://files.theprincessandthec.com/uploads/1/3/1/6/131606123/pozugok-fitadewiru-ponuvodi.pdf
    • http://files.mississippimudkennels.com/uploads/1/3/0/8/130873833/63085.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3124/8542/files/pakibutuvuzofomuvataroxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/jaferamakopotev.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5836/files/kipamikukupal.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/puminafelomarezo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4166/6710/files/muwugefoxofowetifawi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2274/4741/files/17479355783.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/mojisujigasofulasizakoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/8813/3787/files/7973585528.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/circle_equation_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/21831750926.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/cadenas_ganglionares_del_cuello.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_off0000c7fd.bin
30dcf0b84a480e15f0de3c0811f9f4c3174e2e7982e97793b6496210b092d663
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FD 5496 bytes
font_01_sfnt_off0000da95.bin
7094f2e5de2b6cde77af317ac9e6ccc86507a0cf16a4d4032e346b1a94c96643
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 14268 bytes