Malicious PDF — malware analysis report

Static analysis result for SHA-256 836f18e6f7dfde6c…

MALICIOUS

PDF

40.5 KB Created: 2020-09-11 13:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e57d0767df2de07ba6fe9c75774cdb76 SHA-1: 8e1dcb6a55df8c065d7cdb96d70b4c7cb6e0a659 SHA-256: 836f18e6f7dfde6ceb75eec357d5f896e10c95f0112f01a91cf31a56b9d6cdfc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.me/wix?keyword=children%2527+s+aid+society+toronto+reporting'. This indicates a phishing or social engineering attempt. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.me/wix?keyword=children%2527+s+aid+society+toronto+reporting
    • http://nimolo.barefoottofino.com/uploads/1/3/2/7/132741009/8569925.pdf
    • http://files.thesourcemassage.com/uploads/1/3/1/4/131438500/lebuk_vulidagibad.pdf
    • http://files.foliagewoodcarving.com/uploads/1/3/1/4/131454670/birekexujijugaz.pdf
    • http://files.jogscotland-aberdeen.org/uploads/1/3/2/7/132740449/zemifelediruz.pdf
    • http://liluvonog.imperialbathtreats.com/uploads/1/3/1/1/131164250/jipirixitonu.pdf
    • http://notaluzo.serafinarosen.com/uploads/1/3/0/9/130969341/051f869a1831c4c.pdf
    • https://static.usrfiles.com/ugd/cf14a4_7f64c70c449e46deba55ed001c86879c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3be500aae3ec4f30908e389f6d583f57.pdf
    • https://static.usrfiles.com/ugd/4f270c_3c7062d425334d9d801720a9b664ba35.pdf
    • https://static.usrfiles.com/ugd/0b46e6_fc1ef5aa28274b8db1227061e11daed3.pdf
    • https://static.usrfiles.com/ugd/77941b_bdd95ff8b84c4dc3aa02c596f041fc84.pdf
    • https://static.usrfiles.com/ugd/bc0b97_1726230d83a94cd9a23773a7ea018f2d.pdf
    • https://static.usrfiles.com/ugd/89c6ad_963090a0eccb4cbe82bbe2fa35b99c0f.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_off00006151.bin
cba72d059d3bf622ab730e20f99cc2b4cf86e2abb7ff5500301fd860ea3a12d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6151 5376 bytes
font_01_sfnt_off00007399.bin
53fe7b251cff78eaa17e1924996afc44e10c773d51db1888feb65318746bf3c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7399 9816 bytes