Malicious PDF — malware analysis report

Static analysis result for SHA-256 7428b90e22c1c204…

MALICIOUS

PDF

39.5 KB Created: 2020-08-29 20:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24dd04ca2d3d835c37574ca5a5376c89 SHA-1: 31e8aabb5d446c0ecebcefe23bb821e956ac5583 SHA-256: 7428b90e22c1c204365ca8e7b6b6c33efe7a3afa870ffe9ecd115c2aef42de08
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, however, directs to a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning scheme designed to lure users to 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.com/wix?keyword=canon+de+pachelbel+guitare
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2131/8818/files/lalarugu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8694/files/xumaparafujojixib.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/69837419669.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/kolivat.pdf
    • https://cdn.shopify.com/s/files/1/0463/4640/4002/files/37845332741.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/capacitor_definition_and_function.pdf
    • https://cdn.shopify.com/s/files/1/0448/4985/6669/files/anger_management_skills.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3402/files/a_view_from_the_bridge_full_text.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/85243719184.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/lewofomida.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92904811518.pdf
    • https://cdn.shopify.com/s/files/1/0431/5067/2026/files/bangla_koster_photo.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000479c.bin
71c9b4bfa76271a6ae0924a146806e364c893233165b87525fc8d96202aa1b73
pdf-font-stream PDF embedded font (sfnt) at offset 0x479C 5204 bytes
font_01_sfnt_off00005939.bin
acc6fb71638e2c9c4071df9ec6ed11b0b43d273590aff7b69847094eee6ea515
pdf-font-stream PDF embedded font (sfnt) at offset 0x5939 10168 bytes
font_02_sfnt_off00007b9c.bin
f267a97a42ed964490c0c36cf8d24d30f5cfc386ee24850e75bb3a4991f11828
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9C 16376 bytes