Malicious PDF — malware analysis report

Static analysis result for SHA-256 a218696287b1b40c…

MALICIOUS

PDF

43.8 KB Created: 2020-11-04 17:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a987ac76ccfe2417587904541b7f2a5 SHA-1: 78a22c80265c0687b5a1a67b4f3c8fe2b571bc7a SHA-256: a218696287b1b40c8ba1fe5b701da7da8ba50366a37a2ff958bb70d5a125c7b1
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with a critical heuristic firing indicating it leads to known malicious redirector infrastructure. The document body, though obfuscated, contains a URL that aligns with the malicious redirector findings. The presence of a large number of external PDF links suggests a link farm or a method to obscure the final malicious destination. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

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://ggtraff.ru/strik?keyword=define+single+payment+credit
    • https://sopowifumerage.weebly.com/uploads/1/3/4/3/134355846/xapovudisinelajit.pdf
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/8add140d6.pdf
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/dufegozaliv_gazawibenasa_viguvupukuba_xafamogo.pdf
    • https://kosigejobawazi.weebly.com/uploads/1/3/4/3/134315380/piresijov.pdf
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/zobofixumal.pdf
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/5775682.pdf
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/gosisabutima.pdf
    • https://zodovamerevi.weebly.com/uploads/1/3/4/3/134316438/kutasoniral.pdf
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/09946aac22.pdf
    • https://pewoxunoxosizix.weebly.com/uploads/1/3/4/3/134318290/5dbb47.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6903e28e-2b0e-4b18-8af3-d74b3b88712b/41548232564.pdf
    • https://s3.amazonaws.com/sukedil/92574786330.pdf
    • https://s3.amazonaws.com/pezofut/92875656167.pdf
    • https://uploads.strikinglycdn.com/files/e24f8dfd-8391-4349-84a4-64f35715f7a0/telanamunogov.pdf
    • https://uploads.strikinglycdn.com/files/9c930b37-0348-43cc-80c9-7995693f01e5/49253723247.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aac.bin
4a210d176c98caf4f8c4c7996ce5cd7bf48b086a06c63deecb71c7688a40d01f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAC 5576 bytes
font_01_sfnt_off00007d9e.bin
1b4ad9a3952b3f0adb6c7642f737e1d8316b02a031be228582479f8b5a7aed5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9E 10844 bytes

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