Malicious PDF — malware analysis report

Static analysis result for SHA-256 3424afb398d46b67…

MALICIOUS

PDF

54.4 KB Created: 2020-08-18 18:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea7ee2a879d43aa2118c4b7868e60b0f SHA-1: f36a5b3abf1cc5430dfa21027a69712b7ba66237 SHA-256: 3424afb398d46b67da2fdb2ffbb7bab539e968282658239f0966a6e74992e79a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, 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=functions+of+essential+fatty+acids+pdf
    • http://files.acyouthsoccer.net/uploads/1/3/1/3/131379296/sajanoxozowimuto.pdf
    • http://files.vivifymultimedia.com/uploads/1/3/0/7/130775033/4bd9120.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0402/5242/files/vocabulary_games_and_activities_peter_watcyn_jones.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/4354793395.pdf
    • https://cdn.shopify.com/s/files/1/0428/7663/3247/files/adhesive_vinyl_sheets_joanns.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/mowagakesipej.pdf
    • https://cdn.shopify.com/s/files/1/0430/1979/6643/files/misuman.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/vujaxalesolavukepolebo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/vapulerefavowasezep.pdf
    • https://cdn.shopify.com/s/files/1/0440/4147/0117/files/delivery_manager_resume.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/90319054577.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/58451530868.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_off00009839.bin
eaa66a7c2f5559331f34322c4ad15e7a3f3a9abfe4472e3ee43a04e84b201faf
pdf-font-stream PDF embedded font (sfnt) at offset 0x9839 5112 bytes
font_01_sfnt_off0000a9bc.bin
79b0ca6322b373fa0d7fdded75ac47e60b9a957ff121672f56d083715a513806
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9BC 10336 bytes