Malicious PDF — malware analysis report

Static analysis result for SHA-256 812bb83c64b11356…

MALICIOUS

PDF

40.9 KB Created: 2020-11-04 04:21:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6f1122e6fab05c89595a1140b3c0480d SHA-1: 1c7bfd701783212b9a8791344fbba841595d9425 SHA-256: 812bb83c64b11356896dc5b385494fc6f4b049ed02358cacc9b17513a290228c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'frost dk pvp guide' and the malicious URL, suggesting a lure for SEO poisoning or phishing. The ML classifier strongly flagged this PDF as malicious.

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.link/123?keyword=frost+dk+pvp+guide+8.1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5f8b1427bf87a.pdfIn PDF document text
    • https://juwememuju.weebly.com/uploads/1/3/4/5/134523402/vowuradaxutuvumoxiwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5f94bf5eac667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f8d482da5286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5f8ba98c20437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5f8af08a36a8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f8cfc4e7e0f6.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/podivedojowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_5f9dcae8e4729.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/6398b4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_5f91f058f3828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5f9b7d0fa5489.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4bd2c55-2f83-43e6-bba9-b3280b670854/18786537053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00517219-cc08-4130-ab04-073ed30e0ffa/silhouette_connect_full_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5baa02c-83ce-4377-bc8c-f5a2ee9dc7f6/hpx_crypto__piramide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb60a35-7d2d-46f2-a6fb-6bc80b2f3ab1/masuvikag.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_off00006208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6208 5244 bytes
SHA-256: c4748fbd528f298da28f4d960da37fd13c1b6d378272a2132c8007ae733fe417
font_01_sfnt_off0000740a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x740A 10304 bytes
SHA-256: cb3515620505a22a76022ec14a7ca48fb84bc6d0c686c52a8d44bba10f986abe

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