Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c990e5f88e6c7a…

MALICIOUS

PDF

46.1 KB Created: 2020-08-30 06:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee6ff8e80a1ba8540c6a5b2c868a6bf2 SHA-1: 99e5f007e6327c5f95fd127a41e6ca2ca6cd94bf SHA-256: 13c990e5f88e6c7ae395e5150e3aa467385123f2f4efce0812629088eef101e9
154 Risk Score

Malware Insights

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

This PDF file contains a link to a known malicious redirector, which is a strong indicator of a phishing or scam attempt. The document body, though heavily obfuscated, includes the same redirector URL and a list of other URLs pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=transformada+discreta+de+fourier+eje
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/bang_bang_all_song_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0431/0358/4413/files/11615507869.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/zekosovotubezu.pdf
    • https://cdn.shopify.com/s/files/1/0450/4292/5726/files/dreamweaver_tutorial_point.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5510/files/fulifegapiwuzozax.pdf
    • https://cdn.shopify.com/s/files/1/0433/4914/7816/files/41476878069.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/calentadores_solares_de_agua.pdf
    • https://cdn.shopify.com/s/files/1/0464/7301/9560/files/pobimijosenon.pdf
    • https://cdn.shopify.com/s/files/1/0434/4414/2245/files/absceso_perianal_causas.pdf
    • https://cdn.shopify.com/s/files/1/0432/9429/4171/files/nalipitomokerojulepewar.pdf
    • https://static.usrfiles.com/ugd/5be868_c05fd1d2cb8246719d5cf6c1aa7050d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_97576efa759d4dea8604a39c453731cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_91d763632ad34b97860286b937c197ee.pdf
    • https://static.usrfiles.com/ugd/868401_de4ad5a610004859bfec16a27c682136.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7205/files/57633472096.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8072/files/snake_game_google.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/tokovuzeravofi.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_off00006f18.bin
7668876a28bae5d9928de28ab1882b3cfa87510930ba765c6f28ab79d778e2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F18 5160 bytes
font_01_sfnt_off00008088.bin
8ec694e1ce7f1164ff7bfc7e5d1db23896a597073eaeb60a7939da86a7d0bd18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8088 13280 bytes

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