Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5643f8f54aa162…

MALICIOUS

PDF

76.4 KB Created: 2020-07-08 23:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d01d55d1c662c31ab0464cad47336751 SHA-1: 4682dde886ef56095e384db8e606a434db1a42d0 SHA-256: 2e5643f8f54aa1625867887bd153e623678aa942f10b44415f6cdf8e6602bb0b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains keywords related to a book title and the malicious URL, suggesting a lure for users searching for specific content. No scripts were extracted from this sample.

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.ru/wb?keyword=software%20architecture%20in%20practice%20len%20bass%20pdf%20download
    • http://files.grizzlygrover.com/uploads/1/3/1/4/131483440/febisosalabag.pdf
    • http://files.visionsusa.org/uploads/1/3/0/8/130813768/bda94a2cb883e4.pdf
    • http://files.southernoiltransport.com/uploads/1/3/2/7/132740549/lovowa-xekeporil-wumewujaguj-sudagal.pdf
    • http://files.marsjoyofpainting.com/uploads/1/3/1/6/131606127/1986964.pdf
    • http://files.yogashak.com/uploads/1/3/0/9/130969910/zevuru.pdf
    • http://files.freedomdolphindiving.com/uploads/1/3/2/6/132680994/244417b38e2a6.pdf
    • http://files.dannysrods.com/uploads/1/3/0/7/130775983/tigozole_memix_tinev.pdf
    • http://files.bellydancewalnutcreek.com/uploads/1/3/2/3/132303001/2f4246908f2.pdf
    • http://files.ruthbumgardner.com/uploads/1/3/1/4/131407263/34b606873.pdf
    • https://wevekemuvu.files
    • https://sowupaxi.files.wordpress.com/2020/07/72826323985.pdf
    • https://wevekemuvu.files.wordpress.com/2020/07/30022937548.pdf
    • https://xufelositade.files.wordpress.com/2020/07/visiji.pdf
    • https://winorafoza.files.wordpress.com/2020/06/dival.pdf
    • https://lanuterepa.files.wordpress.com/2020/07/67640202953.pdf
    • https://pexakepovovo683334651.files.wordpress.com/2020/07/47881252983.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wajumibuxup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fezusagofetivori.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81667611697.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13578549785.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75901524911.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jedufejaselikaruratemop.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_off0000ded0.bin
02964c205fa3367ba4d31e4400fb8ccf54c307896f550ab85ac5e22a65be5a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 5460 bytes
font_01_sfnt_off0000f152.bin
b8e4db8d40b1a16a26e8643c3ebd5c82413bff92f2a51289efddb7e89f0539c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 16384 bytes

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