Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9b73d280c735a3…

MALICIOUS

PDF

71.1 KB Created: 2020-08-30 06:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07ac5b43803bd1111374b6f2b9575fa2 SHA-1: 8f984ac9b96546256177e661304ca92bdb797218 SHA-256: 3d9b73d280c735a35907043d6ba043d4c6fba33a3c0ea9790131ae28090d9abc
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, which is a common tactic for delivering malicious payloads or leading users to phishing sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags this behavior. The document body, though heavily obfuscated, contains the URL and keywords that suggest a lure. The ML classifier also strongly indicates 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://ttraff.ru/wix?keyword=battlefield+2+commander+tutorial
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/vutetolafezi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0407/3880/files/noxegonat.pdf
    • https://cdn.shopify.com/s/files/1/0433/7516/5594/files/dixoketap.pdf
    • https://cdn.shopify.com/s/files/1/0437/6539/9713/files/juxowito.pdf
    • https://static.usrfiles.com/ugd/253000_bd9044d3bed74d2da72c06e846d7fd06.pdf
    • https://static.usrfiles.com/ugd/ea2f88_94c97233c91646198938382917f5852d.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7917/files/20599822322.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4690/files/54642930413.pdf
    • https://cdn.shopify.com/s/files/1/0432/1538/8840/files/rig_veda_sandhyavandanam_in_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0429/5992/9503/files/zosexeruwumugaga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9023/1974/files/integumentary_system_quiz_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7654/files/56300076033.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7074967355.pdf
    • https://cdn.shopify.com/s/files/1/0436/2004/0866/files/elementary_statistics_johnson_kuby_11th_edition.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_off0000d98b.bin
6d00fa4968908785ce83abf76aeff7e0e7f69d306dec6750f167e88a453e6f2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 5172 bytes
font_01_sfnt_off0000eb02.bin
c196f1a8cf7c5fb74257a7a9bf069048a1b7c28d916dcfcc1fb7a3b18f672a8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 10540 bytes