Malicious PDF — malware analysis report

Static analysis result for SHA-256 195abdc826df7d6a…

MALICIOUS

PDF

45.8 KB Created: 2020-08-14 17:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a9d839eafac8b00b24be510ce56ffbd SHA-1: 19aec05c6ec4a4823014b60d3854ba9b0e4344d2 SHA-256: 195abdc826df7d6a1f4a329070058d7f869b8758ffe02f7cb2d3ddf5be427e06
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on services like Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though partially corrupted, contains text related to 'background music for games' and the embedded links appear to be part of a link farm designed to attract traffic or potentially host malicious content. The ML classifier 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.cc/pify?keyword=background+music++for+games
    • http://files.smartspraytan.com/uploads/1/3/0/7/130776141/180198.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/xojekujekazob.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0782/files/47579053393.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/jodanobevuvoxiredixiwov.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/34408264068.pdf
    • https://cdn.shopify.com/s/files/1/0428/4448/7836/files/aadhaar_download_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/notorious_2009_cast.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/disable_nvidia_ansel.pdf
    • https://cdn.shopify.com/s/files/1/0441/2728/9496/files/61737176663.pdf
    • https://cdn.shopify.com/s/files/1/0439/3258/2056/files/tawipegej.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/mujufifo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bef.bin
c2d7a2ab8030d1f174078d758ecaf10fefdff37b8ab2f3cbb43d4e1314635ed8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEF 5420 bytes
font_01_sfnt_off00007e43.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E43 1800 bytes
font_02_sfnt_off000086d1.bin
aefa8bbc323f452df3a181d1595f8ce9a93117affd0bad5f9405a8ea18386cf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x86D1 10496 bytes