Malicious PDF — malware analysis report

Static analysis result for SHA-256 5953797b16df171b…

MALICIOUS

PDF

52.8 KB Created: 2020-11-08 19:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b88f4a87842a02c1ba8532ff7f2a52c7 SHA-1: 76bff17ab5eaef0ed347a8c35a1674353f38ef29 SHA-256: 5953797b16df171bfb8509b296f87b5b8f6739ef7cb42399a952074438b64f46
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier with high confidence and contains a significant number of external links, indicating a potential link farm or redirection scheme. One of the extracted URLs, 'https://trafffi.ru/123?keyword=cable+tv+guide+great+falls+mt', appears to be a lure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to manipulate search engine results or redirect users to malicious content, possibly via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?keyword=cable+tv+guide+great+falls+mt PDF link annotation
    • https://sofowalomutupal.weebly.com/uploads/1/3/4/3/134310420/zulemagatabi.pdfIn PDF document text
    • https://forovaze.weebly.com/uploads/1/3/4/3/134315943/db98966a667c0c.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/5244421.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bosuwepaxe.files.wordpress.com/2020/11/12568925802.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/fukuxuwelu.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/figukutavuwosuse.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/25887136187.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/authoritative_leadership_style.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.pdfIn PDF document text
    • https://wilojen.files.wordpress.com/2020/11/8330261314.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_off00008ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF3 5332 bytes
SHA-256: 8233e675d84a0eca3b2a6a7b7caa93ca2fa3b3463b650932e5a730d814d23ae1
font_01_sfnt_off0000a102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA102 11044 bytes
SHA-256: d5b1c014c3598e3a052a4a766059dba25b25fd7077cf7e05462860718b3496be