Malicious PDF — malware analysis report

Static analysis result for SHA-256 7735d231fc837c99…

MALICIOUS

PDF

51.2 KB Created: 2020-08-10 23:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebfd7da8d29dc5fea6d4503c9631714a SHA-1: d8f8134beead6e3365e39fbf7462dc7d7216ecd3 SHA-256: 7735d231fc837c99fb101eb32a8d92101edd184d38a296e55c01bf219065bb5d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, many of which point to a link farm infrastructure designed to redirect users to potentially malicious content. The primary redirector URL is https://ttraff.ru/pify?keyword=definicion+de+aprendizaje+segun+varios+autores+pdf. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to lure users to external, untrusted resources, likely for phishing or malware distribution.

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/pify?keyword=definicion+de+aprendizaje+segun+varios+autores+pdf
    • http://files.aphpersonaltraining.co.uk/uploads/1/3/1/3/131398477/91fc5934653c61.pdf
    • http://files.kcorneliusimagesandmarketing.com/uploads/1/3/2/6/132681767/mudatirafilexe_jumeg.pdf
    • http://files.mdvcorp.com/uploads/1/3/1/4/131406714/7134027.pdf
    • http://files.ifacsta.org/uploads/1/3/0/8/130813972/setafos.pdf
    • http://ximoluj.jeffcoltenback.com/uploads/1/3/1/8/131871721/kaguwepatus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1161/9491/files/wugixupatidosefuzopox.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/6753692296.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/2019626445.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/20525636676.pdf
    • https://cdn.shopify.com/s/files/1/0430/7605/9290/files/puvat.pdf
    • https://cdn.shopify.com/s/files/1/0440/5261/1222/files/widipuse.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/powevaligerodirikep.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/fafajixemegugabox.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0295/files/militarum_tempestus.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_off00008666.bin
7b22986848e20b4395cf09314815f4d050927e9579226c18849a8b9a3f6e8b7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8666 5476 bytes
font_01_sfnt_off0000992c.bin
fed94188a141ac709e7fd53bfdc91480b25488ac838307618fe52efc4eb90f43
pdf-font-stream PDF embedded font (sfnt) at offset 0x992C 11080 bytes