Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af0dfac7603d219…

MALICIOUS

PDF

50.2 KB Created: 2020-11-01 02:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f3e0fc941449d05335c171fe1380fa8 SHA-1: 9a496ae7f660be1f617fd9e05ac888734c0e9e90 SHA-256: 1af0dfac7603d2199121e5954d0c9ea099d720d86192d119bfa77eae912d0d9b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though partially corrupted, contains a URL that matches the malicious redirector. The ML classifier and heuristics strongly indicate malicious intent, likely to redirect users to harmful content.

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://gettraff.ru/123?keyword=christmas+poems+for+those+who+have+lost+loved+ones
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/pojododavizufugomi.pdf
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f981356b76fc.pdf
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/7359605.pdf
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/tawezigupozixaviwaji.pdf
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5f8bd626a8b46.pdf
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5f9b407173381.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/95e8b7b2-e79e-4f50-94de-58f5aae46c90/purpose_driven_life_free_ebook.pdf
    • https://uploads.strikinglycdn.com/files/930dbf82-9c68-49e9-891f-c43bb91c669e/modificacion_de_conducta.pdf
    • https://uploads.strikinglycdn.com/files/ed7a05ac-9188-491c-9e18-d921793f8175/92648491130.pdf
    • https://uploads.strikinglycdn.com/files/fa6f9fa7-ddad-4a28-b992-f686607cc681/takupeletalizelabu.pdf
    • https://s3.amazonaws.com/vuraradaso/76795399760.pdf
    • https://uploads.strikinglycdn.com/files/2c2f1fd9-94fc-4fa2-99bc-d1f2b28d96cd/jiwolinojaganisekekore.pdf
    • https://s3.amazonaws.com/wibadinavosunom/89478077840.pdf
    • https://uploads.strikinglycdn.com/files/d90b6083-d47c-4700-9f39-a0791da2bac9/fajari.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_off000084dd.bin
aef860b1149609d2b0427f62f2d2027d59a657393597c4cb927a279d62f6e6f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x84DD 5340 bytes
font_01_sfnt_off000096e6.bin
acab9d9e1990cd90de10a114ed59674aa184da8211218c1dd4f057c25ecd8a62
pdf-font-stream PDF embedded font (sfnt) at offset 0x96E6 10840 bytes