Malicious PDF — malware analysis report

Static analysis result for SHA-256 743590ee196afd0a…

MALICIOUS

PDF

33.9 KB Created: 2020-08-28 05:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d16700ac4f290f457541d230bf750934 SHA-1: e4e5c69f821d8326e9dfc53549f934f8759ba62e SHA-256: 743590ee196afd0a4aa3727f7aeeda212b5711a0996deb598fc34653a2711faa
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=ambientes+de+aprendizaje+bransford`. Additionally, it exhibits a PDF link farm heuristic, containing numerous external links, with the first being `https://cdn.shopify.com/s/files/1/0437/2152/3349/files/gomadiwirelabuwerakas.pdf`. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the document's primary purpose is to redirect users to potentially harmful sites.

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=ambientes+de+aprendizaje+bransford
    • http://litazu.cutekidscrochet.com/uploads/1/3/0/8/130874376/muxiroguvibutujaso.pdf
    • http://kexirol.mithalurim.co.uk/uploads/1/3/1/3/131379732/8068893fa74.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2152/3349/files/gomadiwirelabuwerakas.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/54619212049.pdf
    • https://cdn.shopify.com/s/files/1/0436/8341/4169/files/13226130189.pdf
    • https://cdn.shopify.com/s/files/1/0433/7238/0314/files/tamil_love_album_songs_remix.pdf
    • https://cdn.shopify.com/s/files/1/0446/6973/0979/files/calendrio_escolar_angolano_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/65862595070.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/bizijawubojedodozafomiloz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0743/3125/files/libununoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/mechanical_parts_7_days_to_die.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/english_speaking_topics.pdf
    • https://cdn.shopify.com/s/files/1/0429/7293/8399/files/asus_smart_connect.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_off0000470b.bin
5db6e7f2bc22be7c4ab084e5e61228a11a2b1e3fe53d04442281102583af7686
pdf-font-stream PDF embedded font (sfnt) at offset 0x470B 5412 bytes
font_01_sfnt_off0000595c.bin
940a80aa6e91b8fc0a2f457ac10cce20628a1ea24e89f91f9ba412bddca56b43
pdf-font-stream PDF embedded font (sfnt) at offset 0x595C 9852 bytes