Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5dc9e5b1b096da…

MALICIOUS

PDF

39.0 KB Created: 2020-08-06 08:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa87aa40c1d4246ddd25dc8ad3ef5682 SHA-1: 705157c154f46bf196db82379775560a2fd69578 SHA-256: 0b5dc9e5b1b096da03e2ce148765ef6cb3804c50c545e5f21959f8145a22a1ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=handbook+of+psychological+assessment+4th+edition+pdf', which is likely used to funnel victims to malicious content. The ML classifier also strongly indicated maliciousness.

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=handbook+of+psychological+assessment+4th+edition+pdf
    • http://files.pfcmooremess.com/uploads/1/3/0/7/130776072/65264bc54.pdf
    • http://maxeba.minkacademy.com/uploads/1/3/1/8/131857920/nubuled.pdf
    • http://files.plainlanguageacademy.com/uploads/1/3/1/1/131164419/9247740.pdf
    • http://files.glendowiecommunitycentre.org.nz/uploads/1/3/0/7/130776509/lorebed.pdf
    • http://files.crescentmoondesignsjewelry.com/uploads/1/3/0/8/130873738/suwekitumipuwa_netowajilavo_vutok_givusa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/71326010099.pdf
    • https://cdn.shopify.com/s/files/1/0435/7813/0593/files/27150653335.pdf
    • https://cdn.shopify.com/s/files/1/0440/8757/4678/files/5695952284.pdf
    • https://cdn.shopify.com/s/files/1/0431/7642/7686/files/65180219605.pdf
    • https://cdn.shopify.com/s/files/1/0450/6569/9478/files/vegas_pro_cracked.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2753/files/mesuvigikumuviwenazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/jototovositiwafa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/liberacion_y_absorcion_de_farmacos.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/vonuninuzimeletojefuvuzu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1225/7952/files/pazuwugopulokomidiraf.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/54952730317.pdf
    • https://cdn.shopify.com/s/files/1/0434/9624/3364/files/terror_of_infinite_drifts.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/cuaderno_de_vacaciones_de_blackie_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/job_batch_and_mass_production.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_off00005628.bin
7153e87eec3946554dc99b22d11e4b1efd6851bc7239536b3e22c9211692da0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5628 5828 bytes
font_01_sfnt_off000069e9.bin
62b58169a012f90f0286556b486dc94bcfb0853d9c7f06b5c6ed69a98bcac66f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E9 10160 bytes

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