Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c93d14789fba335…

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 04:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f6a9f6cb052bf9cbbcaa239ae13d8f7 SHA-1: 8f1d3c4d5bebae088d3a99e87fd80d350c316c0e SHA-256: 6c93d14789fba33539417fe139d437da5fb3b5b8bcece8dd4e1343edfc30e59d
194 Risk Score

Malware Insights

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

The PDF contains a fake CAPTCHA lure, directing users to download software. It also hosts a large number of external PDF links, likely for SEO manipulation or to distribute further payloads. The primary malicious URL identified is https://ttraff.ru/wix?keyword=descargar+revit+2018+full+ingles+64+bits, which is flagged as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/wix?keyword=descargar+revit+2018+full+ingles+64+bits
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/moname.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/66795769201.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/41643859794.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1616/files/87236889692.pdf
    • https://cdn.shopify.com/s/files/1/0462/7575/6181/files/lined_handwriting_paper_template_landscape.pdf
    • https://static.usrfiles.com/ugd/097bd5_7f9cb0ac65094b1db7a4f636d4b1f5f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2cdf11cf77d41e495478a8651f93925.pdf
    • https://static.usrfiles.com/ugd/b8c837_1de87f838e7b449388f40ad979f462a4.pdf
    • https://static.usrfiles.com/ugd/b48b60_36ba5272657245bfbc31fa2ed4ac7b13.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3783/files/13234920006.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1682/files/berker_1930.pdf
    • https://cdn.shopify.com/s/files/1/0463/6085/4683/files/pekowito.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f5f.bin
41b7fbb1bd72dee52706c6ad03f0555d9e26756a1f3be2656fa75676317ee21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5F 5780 bytes
font_01_sfnt_off0000732f.bin
cbb26297cccb736a1cca48b520bc786a6436471bd58db34780bf79f8560b9f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732F 10416 bytes
font_02_sfnt_off000096d3.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96D3 4324 bytes

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