Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8ae624929d3fa9…

MALICIOUS

PDF

44.2 KB Created: 2020-08-08 23:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92ee87e0ba1ba59dd29c86d0133365b4 SHA-1: f14893b7b0faaf3a2286737bda34f67649564759 SHA-256: 0f8ae624929d3fa916ee758b3589c65c50496d096ad3feb0f0058f4ea74a1e00
162 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for distributing malicious content. The embedded URL 'https://ttraff.ru/pify?keyword=pathfinder+bestiary+pdf+download' is flagged as a known malicious redirector. The document also contains a large number of links to other PDFs, likely for SEO poisoning or to mask malicious activity. The ML classifier strongly indicates maliciousness.

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/pify?keyword=pathfinder+bestiary+pdf+download
    • http://files.sarahtorti.com/uploads/1/3/0/8/130873741/barubinajorara-nodomixudovorin-lujafanofuvuz.pdf
    • http://files.clinicaespacosaudebeleza.net/uploads/1/3/2/6/132682892/2618356.pdf
    • http://files.rinconcasa.com/uploads/1/3/0/9/130969703/rifomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/60143830226.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mujunevuduw.pdf
    • https://cdn.shopify.com/s/files/1/0434/2474/3591/files/arihant_integral_calculus_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/gurawizaru.pdf
    • https://cdn.shopify.com/s/files/1/0437/8794/4094/files/68560709167.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/63503140726.pdf
    • https://cdn.shopify.com/s/files/1/0431/1836/2781/files/car_suspension_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/51829719086.pdf
    • https://cdn.shopify.com/s/files/1/0432/3255/9267/files/87463896104.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/tapulodufew.pdf
    • https://cdn.shopify.com/s/files/1/0435/9231/9138/files/tepibi.pdf
    • https://cdn.shopify.com/s/files/1/0439/9765/9294/files/agile_project_management.pdf
    • https://cdn.shopify.com/s/files/1/0437/5327/5546/files/bevetivupixaverukovopidaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/14955468619.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_off000061a2.bin
82f2090cdd8d2c393889facbd55fdcfaec03e6c6cd0b5fcdafe48db7137667e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A2 5464 bytes
font_01_sfnt_off00007444.bin
3c6e38841fc1e53889826983ee82d77c10562733d712e48d3ab9595cd07fe90c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7444 15292 bytes

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