Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61168105473c0b6…

MALICIOUS

PDF

33.4 KB Created: 2020-08-12 02:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d2c7b340b3e97f7c63095b9938571cb SHA-1: d8ba7b1b0f33acc4f3ae60bcd5f6a60ffd36168d SHA-256: e61168105473c0b69a6b7b04e27c4ed1442be16d5c53247d95355d3b359915cc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link redirects to a known malicious redirector at ttraff.cc. The document body, though heavily obfuscated, contains text related to academic books and the redirector URL also includes a book title, suggesting a lure to trick users into clicking malicious links. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=seeley
    • http://mogaxeri.fayekenajianproductions.com/uploads/1/3/1/0/131069839/d35a3ee950842.pdf
    • http://files.theflockjwr.com/uploads/1/3/0/7/130739831/rixorofamox_muvenid_leremelanemenom_soledaj.pdf
    • http://zibur.tomwright.ca/uploads/1/3/1/4/131453329/65fad9455d0.pdf
    • https://cdn.shopify.com/s/files/1/0431/7128/3098/files/3251818260.pdf
    • https://cdn.shopify.com/s/files/1/0435/5004/8420/files/defafadomenapalemu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3525/files/hp_48gx_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/gobisewosuref.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/pasokugamiwezasetipeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/0213/4681/files/basic_sales_skills.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/international_criminal_law_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/tukizogagodiwerulegazido.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/73908144961.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0142/files/muvipilivakid.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/discord_clear_messages.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004342.bin
b5c2e3fd72b9be09f5a6a4ea7a4ee17c02cd9d35f95f657d6adde4396954d8bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x4342 5756 bytes
font_01_sfnt_off000056c1.bin
f0fdefd14d8543c2e50203cd12f83977754449629e6071c42c582fdf3f3cb744
pdf-font-stream PDF embedded font (sfnt) at offset 0x56C1 9344 bytes