Malicious PDF — malware analysis report

Static analysis result for SHA-256 a525bac9425c9637…

MALICIOUS

PDF

53.5 KB Created: 2020-09-05 00:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07f76d462cf9c8a088908e154e339d2f SHA-1: e9cc36d7bbd1d8c72a882b55f72e55b96687ce27 SHA-256: a525bac9425c9637b3baab3612eb25f132e1aab2ca35fb71537c88e3326f5ee1
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, https://ttraff.me/wix?keyword=canon+eos+m50+user+guide. The document body, though heavily obfuscated, contains references to the user guide lure and the malicious URL. 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.me/wix?keyword=canon+eos+m50+user+guide
    • https://static.usrfiles.com/ugd/1849a1_c52243a781f44afe8490f4cf0dcefc7c.pdf
    • https://static.usrfiles.com/ugd/17159d_9804bb810d1d4f51a001d0c0eef5eb05.pdf
    • https://static.usrfiles.com/ugd/035627_65f7dbd7e49d4dfc87a6d185258dd506.pdf
    • https://static.usrfiles.com/ugd/a59130_b343540b26a942f39d165a8c76c07d56.pdf
    • https://static.usrfiles.com/ugd/0779a3_86bfc667a04d4572b168a8588eb8b7f1.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.pdf
    • https://cdn.shopify.com/s/files/1/0433/3531/9702/files/beverage_air_spe72-_30m_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1305/3338/files/41175077113.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8777/files/47766676009.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/bodetonavuna.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/51448862763.pdf
    • https://static.usrfiles.com/ugd/b9801a_5eccecf3ff0742b7be5f9b30ed3f5af6.pdf
    • https://static.usrfiles.com/ugd/b58d21_56e7823c34164e099b62a5075d30cf4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ff0917d947c45d19f3b22cda3ddc578.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_off000075b5.bin
83d1e66d47970b559ac614f471787bdc225bc7f73e37a5e0e72f78c4f4739e57
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B5 5284 bytes
font_01_sfnt_off00008792.bin
df4a437fd4faea2d0dd582636222ee127f5d184e7564c4b95fab1409372a3dd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8792 13676 bytes
font_02_sfnt_off0000b19f.bin
4fb18f2f8d176c0c9ddf893a3a69c6eaaaf8ae8309617b6e07033971a2ed751b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB19F 16684 bytes