Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a426f91f7748fab…

MALICIOUS

PDF

43.9 KB Created: 2020-09-16 18:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb1bfe97afa04c55c485189ca7ce4bee SHA-1: b1cf2c9b5c6193d10e9cbe3dc7644e0e76b2e554 SHA-256: 9a426f91f7748fab4a484f8e3a1deb34c0abe17ba59dc0d1fa1ef41b1aa927ed
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded URLs, with one identified as a malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links, likely for SEO poisoning or traffic redirection.

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.me/wix?keyword=%25D0%25BC%25D0%25B0%25D1%2582%25D0%25B5%25D0%25BC%25D0%25B0%25D1%2582%25D0%25B8%25D0%25BA%25D0%25B0+3+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581+%25D1%2580%25D1%2596%25D0%25B2%25D0%25BA%25D1%2596%25D0%25BD%25D0%25B4
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/informational_text_worksheets_8th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/tovolitunofixatub.pdf
    • https://cdn.shopify.com/s/files/1/0439/2153/9240/files/26725139632.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/94360929289.pdf
    • https://cdn.shopify.com/s/files/1/0428/6906/3836/files/makeup_artist_portfolio_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/98528997250.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/a_level_physics_questions_by_topic.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/mabaponobiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/6550/0060/files/85159587956.pdf
    • https://cdn.shopify.com/s/files/1/0431/9736/6436/files/dudibosilalewivakimek.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/angular_5_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.pdf
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/jexikuboxovepenigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2204/0731/files/99665140968.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/chikni_chameli_song_video_pagalworld.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_off000053ed.bin
4003395e2b8f6ec7b6c33b40d6ec7cd189025b1affd6b68487039abe3a064e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53ED 4956 bytes
font_01_sfnt_off000064eb.bin
c3310b8d320f4f4f6a0c7070e19d16686ce600c38d7eeb9c1069955ba008bd57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EB 14664 bytes
font_02_sfnt_off00009248.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9248 4324 bytes

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