Malicious PDF — malware analysis report

Static analysis result for SHA-256 479b34265b91a634…

MALICIOUS

PDF

41.1 KB Created: 2020-08-10 13:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09625bae10b9da9248310d5c1e1a9f9d SHA-1: 8f76ad7236dac56f173ec2801442bedd03f2ea27 SHA-256: 479b34265b91a634840bf6ad6f356f26cdb9d24874484fef60475a6eb95a0e4e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains multiple embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though obfuscated, contains text related to "Christmas medley piano sheet music pdf" and a URL pointing to a redirector. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute 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=christmas+medley+piano+sheet+music+pdf
    • http://files.bsastemresources.com/uploads/1/3/1/3/131384071/zojixo.pdf
    • http://files.nadianiyazi.com/uploads/1/3/0/8/130814596/6870909.pdf
    • http://files.auburnhistorical.org/uploads/1/3/1/3/131380849/zuziluxobijupesu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/tuxemolirana.pdf
    • https://cdn.shopify.com/s/files/1/0437/5743/7080/files/rafidozejubarafodumekid.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1794/files/tofame.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0503/files/viparozomulowujol.pdf
    • https://cdn.shopify.com/s/files/1/0432/0785/2192/files/kotagegudanubizubagi.pdf
    • https://cdn.shopify.com/s/files/1/0450/3132/5846/files/dresden_files_rpg_paranet_papers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0655/7341/files/11072987679.pdf
    • https://cdn.shopify.com/s/files/1/0432/2466/2173/files/83063599906.pdf
    • https://cdn.shopify.com/s/files/1/0431/4038/2882/files/fiwizetag.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/34437512404.pdf
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/biology_revision_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/3758/1734/files/bard_and_faulkner_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/37848660369.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000551c.bin
3d8853ec5e73ae717f9c54246ada465dc3ace8991317caa9f13915cc0461983d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x551C 5404 bytes
font_01_sfnt_off0000675c.bin
c0f139c92808231b0b8fd35b83b0776cf705b978d76180b24382efe19fdb8ae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675C 9896 bytes
font_02_sfnt_off0000894b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894B 4324 bytes

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