Malicious PDF — malware analysis report

Static analysis result for SHA-256 b681d5e45f92b7fe…

MALICIOUS

PDF

37.1 KB Created: 2020-11-02 23:24:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 757dad0a34b75afa373ac07304628579 SHA-1: 5cff084f422a1a9a112524233d7c78740033a878 SHA-256: b681d5e45f92b7fe7359182cfa196b3092670351f77f408ba5583d559ad71ae1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.link/123?keyword=odysseyware+algebra+2b+19-20+answers', is identified as a malicious redirector. The document body, though partially corrupted, also contains this URL, indicating an attempt to trick users into clicking it. 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=odysseyware+algebra+2b+19-20+answers
    • https://cdn-cms.f-static.net/uploads/4391611/normal_5f903a418c347.pdf
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5f9c0be29c18e.pdf
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/lokugu-nezexupakux.pdf
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/vuzelafam.pdf
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f8842293abfd.pdf
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5f91e958a8313.pdf
    • https://nujidigazinuwag.weebly.com/uploads/1/3/4/3/134318548/kirotenoda.pdf
    • https://vifedunujaxali.weebly.com/uploads/1/3/4/3/134398483/a9978033341cd56.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0501/6476/0751/files/sweet_camera_selfie_beauty_camera_filters_apk.pdf
    • https://s3.amazonaws.com/muvarelo/the_explosive_child_free_download.pdf
    • https://s3.amazonaws.com/zupenafud/comptia_a_plus_objectives.pdf
    • https://s3.amazonaws.com/golepe/512_solved_assignment_in_hindi.pdf
    • https://s3.amazonaws.com/kijelopazekune/catalogo_tinta_suvinil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046a4.bin
f0fcd76b5237e99fe294a805b8c0aa42793d5d59fd770c4d2ee42ea21ef722f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46A4 5416 bytes
font_01_sfnt_off00005931.bin
39c0998b57450d93b52ddbb08fdd748e1fe9c8edc037245e136f20accbca1fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5931 9488 bytes
font_02_sfnt_off000079b5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B5 4324 bytes

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