Malicious PDF — malware analysis report

Static analysis result for SHA-256 765945bd59f1c901…

MALICIOUS

PDF

52.8 KB Created: 2020-08-05 23:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2da83c03c4939629ebd1f967d88795aa SHA-1: b3a2f432577ffae9e300695064c9e9f935f2b4a0 SHA-256: 765945bd59f1c901b6a1c76821e54047d14a28d40747db7262203201472df8ad
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=geriatric+assessment+procedure+pdf`. The document body, though heavily obfuscated, contains text related to "Geriatric assessment procedure pdf" and the authoring application, likely a lure to disguise the malicious intent. No scripts were extracted, but the presence of malicious redirector links strongly indicates a phishing or scam attempt.

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=geriatric+assessment+procedure+pdf
    • http://files.timetraitor.com/uploads/1/3/1/4/131452988/darato.pdf
    • http://files.lexmarch.ca/uploads/1/3/0/8/130814078/90637ce1.pdf
    • http://files.letsgotravelagents.co.uk/uploads/1/3/1/8/131856626/zigovuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wesani.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/dovesetavamubuti.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/21273936023.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/application_of_laser_in_highway_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/16394776186.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/63587102340.pdf
    • https://cdn.shopify.com/s/files/1/0430/9408/1687/files/jomuwupuxugaduzajatavigob.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/babifibivozopi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/dagoxurilapuruwimuxof.pdf
    • https://cdn.shopify.com/s/files/1/0434/2395/7144/files/xamizoresumasarenisibezap.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/7647703421.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/65965925632.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_off00008397.bin
9225032b8c32a13284ab61ab2992cacfd7ba292de55472acb6bca7730c815295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8397 5180 bytes
font_01_sfnt_off00009518.bin
58f5a8d3e629d42b8afebbb6464129889b303e0b77ee8c556208b6a5965bfd6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9518 10136 bytes
font_02_sfnt_off0000b7bd.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BD 4324 bytes

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