Malicious PDF — malware analysis report

Static analysis result for SHA-256 3296f4eba58e95b1…

MALICIOUS

PDF

36.4 KB Created: 2020-08-08 18:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b4c48e327d764b6d78069f6fe18d447 SHA-1: 7550c5cee8f093549264b106134a2fd9240f3f5d SHA-256: 3296f4eba58e95b10915bee314394dcf5fb5407a1f17fdce1231dc88ed9c4f1c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body contains the malicious URL, suggesting a lure for users to download potentially harmful content. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=talley+clinical+examination+pdf+free+download
    • http://files.communityspokes.com/uploads/1/3/1/3/131379099/nufalirofado_wenogopopi_pipilosop.pdf
    • http://files.ntfbiac.com/uploads/1/3/0/8/130813973/reped.pdf
    • http://files.racheldmark.com/uploads/1/3/1/4/131453486/pixobagi_fotosabesunibol.pdf
    • http://bebimilig.olygarfieldpta.com/uploads/1/3/1/6/131607600/tekuponosoradud-nanikoreda.pdf
    • http://files.cfcstuttgart.org/uploads/1/3/0/7/130739495/61fe14292b26.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/1037408827.pdf
    • https://cdn.shopify.com/s/files/1/0434/7153/6290/files/convert_base64_to_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0429/0894/2492/files/demonomicon_4e.pdf
    • https://cdn.shopify.com/s/files/1/0428/4379/9719/files/neologismos_en_el_espaol_actual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/xefovofazek.pdf
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/51978628143.pdf
    • https://cdn.shopify.com/s/files/1/0434/5767/5431/files/el_sitio_de_leningrado.pdf
    • https://cdn.shopify.com/s/files/1/0437/0972/6870/files/93855851516.pdf
    • https://cdn.shopify.com/s/files/1/0435/6240/1947/files/puxosaxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9530/files/59481656344.pdf
    • https://cdn.shopify.com/s/files/1/0431/8927/2725/files/email_examples_for_business_communication.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/wewexafirudigamivezit.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7208/files/75818580463.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fb4.bin
63a57fec96aabacac1033c25bc69b278d3ac3b67fecdac7b909a4115ecd4ca20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB4 5332 bytes
font_01_sfnt_off000061e3.bin
86928492c3ca21cbaf5b9cf77652a4a17f8854f9e13958ec8f86fa0c82b5b203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E3 10164 bytes

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