Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fbc7e9c3dd5e17…

MALICIOUS

PDF

72.1 KB Created: 2020-08-10 15:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28def5060c237eb95a8ccae50190f14b SHA-1: e8e60f05751b1b92b3da9758446b7a97a9f0b0af SHA-256: c9fbc7e9c3dd5e1741de61aeccd8f22081249e71d682dddf14a3428775f8bad4
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to 'https://ttraff.cc/pify?keyword=business+research+report+pdf'. This URL is part of a link farm that hosts a large number of other PDF files, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing malicious redirector links.

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=business+research+report+pdf
    • http://files.allysonkellum.com/uploads/1/3/0/7/130775825/juberekojotemeru.pdf
    • http://files.2in1story.com/uploads/1/3/1/4/131438211/bubemigiwivir-wudiwireramebu-nonokuzifo.pdf
    • http://biboz.xtremepaintbody.com/uploads/1/3/1/3/131398140/kijakagobixavu.pdf
    • http://files.madisonavebaptist.org/uploads/1/3/0/8/130874587/15dba07e70eeb9.pdf
    • http://files.al-abdulqader.com/uploads/1/3/2/8/132816042/nonev.pdf
    • http://files.2in1story.com/uploads/1/3/1/4/131438211/bubemigiwivir-wud
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/juzukinakugi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7261/files/5555996841.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/xikofupuxezomevazeru.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/lutodew.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7219/files/greek_math_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/divufa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/dadunudutufevuzu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9464/7719/files/neverwinter_nights_walkthrought.pdf
    • https://cdn.shopify.com/s/files/1/0434/2241/7047/files/angels_landing_trail_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/4496/1442/files/dokoxuvumujizojere.pdf
    • https://cdn.shopify.com/s/files/1/0443/4529/5004/files/sociologia_del_trabajo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/87493624523.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_off0000de4d.bin
c2aaa458cb6ad0dab24accca35a897b661ec0132b1d45378fe7efb1d736907e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 5260 bytes
font_01_sfnt_off0000f01c.bin
ea6b2c4af224fdbd234f5f0f3d4c1db015c04e0bb13a651b5981a7105b768622		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 10356 bytes

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