Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b24abbad8924cea…

MALICIOUS

PDF

40.0 KB Created: 2020-09-10 09:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 02ba6f795319f0112b8f171ccd30c9bc SHA-1: 180204175c787c7a30ebf98ba0ecaf41ae69216a SHA-256: 0b24abbad8924cea1604a957a242e0e34ccc4794a72127d43c9cfab7929f0d5b
162 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=mathematics+11th+book+pdf, which is a known malicious redirector. The presence of numerous other PDF links suggests a coordinated effort to distribute malicious content.

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.cc/wix?keyword=mathematics+11th+book+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/0779a3_f0b7cbd3c61c444ba9ef0c13cd5b0936.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d8966e_825808f5399c4b7095c2d3a2a46a4c53.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/06497e_3298f44a9f4041f48b55132a08104a7f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d90490_cf25a7b2c0a5445181ed78e2976013cc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0358/4409/files/nuzutaravozisazakefax.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2f3ac6_dca997ebadbe4e3eb6d29a101ddea95a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bb3bf9_01d31d7a7bf54c6e8e3ad56fc96bbd92.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8156/3298/files/fokexipigap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/61842795954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8817/5519/files/xugolufedanize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/9377/0654/files/musijitolejufemolugofu.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_off00005e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9B 5528 bytes
SHA-256: 65bc2a0913efa71b8d7ba2b2ce6e962df9a4630539c3d57d4d907b4437a2e5b8
font_01_sfnt_off00007150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7150 10116 bytes
SHA-256: 48cc4cf872f2f282f1c8db0a290308b6c62e0c0979bf032ae854ce79aa21f8a7

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