Malicious PDF — malware analysis report

Static analysis result for SHA-256 920480f1619407ae…

MALICIOUS

PDF

47.4 KB Created: 2020-08-19 16:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c587281cbf0cbdd283991ba45570812 SHA-1: 2439e93001389b8322badc602690eec09708de50 SHA-256: 920480f1619407aebe14f8a159a2a46d490c93fd085ba1a1a5b73d843698a01d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com' with a keyword related to sports news. The document body also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or content distribution strategy. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click the malicious link within the document.

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.com/pify?keyword=new+orleans+saints+injury+report+week+10
    • http://files.sweetspotstrategies.com/uploads/1/3/0/9/130969404/tenor_nexit_tojujerekivo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1779/7785/files/gupesisetixijajisev.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5377/files/the_addiction_treatment_planner_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/waxuvatalaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/1630/6344/files/komorapanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0242/0644/files/18775870784.pdf
    • https://cdn.shopify.com/s/files/1/0429/3951/5039/files/xixopinavofedubesisob.pdf
    • https://cdn.shopify.com/s/files/1/0440/8901/6472/files/materi_organel_sel.pdf
    • https://cdn.shopify.com/s/files/1/0430/1016/2837/files/govivafunomujuk.pdf
    • https://cdn.shopify.com/s/files/1/0448/9661/6615/files/lightning_thief_graphic_novel.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_off00007b68.bin
8f4f57f7981b97922c1e61253f521a0aa9e3f5d8c68124bc2ca979e742940d67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B68 5308 bytes
font_01_sfnt_off00008da5.bin
b1a5263806254c4e76f9c3183cebc5da420143279afdefab4dcaaf8e846019e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA5 10304 bytes

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