Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8e09fb332a8f61…

MALICIOUS

PDF

41.2 KB Created: 2020-08-07 18:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5066b944fb5327a38bc3d45693dff511 SHA-1: 6f810981cede8a71a34e44d25d2fbbfa54f478e3 SHA-256: 6b8e09fb332a8f61260fe55f88f69e353a61a95b3feb7d5039d2de33d4817100
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to SEO-optimized PDF farms, a common tactic for distributing malicious content. One critical heuristic identified a link to a known malicious redirector infrastructure, `https://ttraff.cc/pify?keyword=exercice+sur+les+animaux+en+francais+pdf`, which likely serves as a gateway to a malicious payload. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=exercice+sur+les+animaux+en+francais+pdf
    • http://nufosurek.organizationcommunicationinschools.com/uploads/1/3/1/8/131858685/jinorisozuvikolame.pdf
    • http://gosiweg.exploringoverload.com/uploads/1/3/0/8/130874197/8c4cdee3035ea65.pdf
    • http://files.wordoflifechristianfellowship.org/uploads/1/3/1/3/131383283/nokudib.pdf
    • http://files.mrpalmieri.net/uploads/1/3/1/4/131483279/e0f47ebd69bf3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1367/5928/files/senior_system_administrator_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/4358/4162/files/peter_handke_knjige.pdf
    • https://cdn.shopify.com/s/files/1/0434/4283/1522/files/waforukog.pdf
    • https://cdn.shopify.com/s/files/1/0432/3917/8399/files/4873000792.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/vemeforikifatok.pdf
    • https://cdn.shopify.com/s/files/1/0450/7457/9608/files/vegetable_biryani_recipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/administration_and_management_in_criminal_justice.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pidepuwavulosetanujerepub.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2503/files/janosatozup.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8845/files/pazazazo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8554/4089/files/63149272212.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/8322534106.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_off00005d2c.bin
5564a8cbd29a4112c91b1bfdabda15a269d203e9ba88b07bb601ad6a5af82b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2C 5328 bytes
font_01_sfnt_off00006f40.bin
9ab645bd167d553ad61417c5f18998b91041e5d9e9ac823009c405c9e81ee523		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F40 12284 bytes

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