Malicious PDF — malware analysis report

Static analysis result for SHA-256 22244b11b4251e67…

MALICIOUS

PDF

37.8 KB Created: 2020-10-03 18:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a17b26baa3d565ce7065a603519f80c6 SHA-1: ed9b329b77fbe81e80aa7060b5b669bff0af3362 SHA-256: 22244b11b4251e673799d0ce8b4f4a011c8abce1b1fbe801f25f2bf69acfbff8
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one specifically identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=stihl+028+manual In PDF document text
    • http://files.heartlandwestfargo.com/uploads/1/3/0/9/130969658/1d37df34.pdfIn PDF document text
    • http://laxag.madelinedonnerstag.com/uploads/1/3/2/3/132303164/jorej.pdfIn PDF document text
    • http://kofomanom.prynneshop.matchpages.com/uploads/1/3/1/3/131380828/lutamamodof-jinoser.pdfIn PDF document text
    • https://site-1038555.mozfiles.com/files/1038555/xasesimuxuvokibi.pdfIn PDF document text
    • https://site-1036955.mozfiles.com/files/1036955/kobexelu.pdfIn PDF document text
    • https://site-1038743.mozfiles.com/files/1038743/92673434998.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4984/4890/files/microscope_crossword_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2801/6036/files/teck_alaska_incorporated.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3378/3203/files/41343377077.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7025/9357/files/38965356112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92518a65-f969-4fe8-8f01-3700a43c15fb/pufefidena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411f7426-09b3-413f-99a9-71f6e6d73785/biduven.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5758 5220 bytes
SHA-256: 12451b0a6b9b895dbd048a73f32c7c78c107ba2b051ad4226a13a3e7500535ea
font_01_sfnt_off000068f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68F5 9968 bytes
SHA-256: 61220dacd80c1ed400b4797729771dee86170ff16de145abb56c3e1095c464f5

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