Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d91cf9b1450e347…

MALICIOUS

PDF

52.2 KB Created: 2020-08-31 08:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 583405d850481e2a60d0053ccdaab953 SHA-1: d03301f57e0e3587a87231f2920f2a4bce38435c SHA-256: 0d91cf9b1450e347879d0ceea907ef090955957c58abd6fe42b4bf6fdd84da88
162 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that suggest a lure to external content, potentially for phishing or malware delivery. The presence of numerous PDF links points to a link farm strategy, likely to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=365+questions+journal
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/22465667605.pdf
    • https://cdn.shopify.com/s/files/1/0430/9064/1047/files/vajel.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/badlapur_full_movie_720p.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6530/files/7583310402.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/80359167615.pdf
    • https://cdn.shopify.com/s/files/1/0434/1645/3272/files/36477967178.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/9399769280.pdf
    • https://static.usrfiles.com/ugd/f967ac_497efc7c4dd640e5b5dee1f4cb9c0805.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2e7247bb0044db9b5e64c5a0c58f8ea.pdf
    • https://static.usrfiles.com/ugd/fedf23_1d4425cbbe904881bd4c9003513ddf17.pdf
    • https://static.usrfiles.com/ugd/76de1a_306ea8013d9544389dcd139890e588f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7acab406c2143de8b869b3fdc374bf4.pdf
    • https://static.usrfiles.com/ugd/b5aed9_ae2f1d0c0fad4e7bac9cfb411836064d.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c308b80a8334f6cbbac0840859dd934.pdf
    • https://static.usrfiles.com/ugd/b8c837_39557059412d42bda1aebf6696bb70ad.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_off00008da9.bin
cb546ff63b10ea236f5d917fe7a82797c1ed8ab96547625bcffdafb13147fe8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA9 5228 bytes
font_01_sfnt_off00009f7d.bin
b69b66fa07d1f1cd9498867531537ceda871b46b2b69bf8772b3ef1034c6ec7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F7D 10924 bytes

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