Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc44b9d1b177f66…

MALICIOUS

PDF

38.2 KB Created: 2020-09-02 14:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce646136edd04e431ea434234cdce79c SHA-1: 6515f3fe72b2c755002d3665d9180e6245214ea9 SHA-256: 0bc44b9d1b177f667ba74d03ed300bdcd69a35738daada2bf07f884431e27147
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=word+story+addictive+game+apk'. This URL is presented within the document body, alongside numerous other links to PDF files, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=word+story+addictive+game+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1720/7971/files/50563425142.pdf
    • https://cdn.shopify.com/s/files/1/0439/7072/3998/files/89226770307.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/kedudakux.pdf
    • https://cdn.shopify.com/s/files/1/0435/9127/0563/files/41347350026.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3315/files/protocolo_de_trasplante_de_medula_osea.pdf
    • https://static.usrfiles.com/ugd/3bcfef_76c6d8375ea5410480bd9a6f22582388.pdf
    • https://static.usrfiles.com/ugd/cc03df_b6456e5eb4fe46a59a5e0cf162846728.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfcda2e4e5bd4a3d8b7503cf0da89f99.pdf
    • https://static.usrfiles.com/ugd/3bcfef_fc246f75200e44efb457879fda20d35c.pdf
    • https://static.usrfiles.com/ugd/76dd3d_8a35a09909a746d5951cd759ec934969.pdf
    • https://static.usrfiles.com/ugd/9e53d4_7613e674ef7b4f1e82ee8acefa376ae1.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b1e878f1dd7498dbc15d5241deaae83.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/fekivifixub.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/20140007762.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/82031789137.pdf
    • https://cdn.shopify.com/s/files/1/0433/3951/4006/files/gedibitetegewetexafe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054cc.bin
442a118b5780bf72fb4aefaeba3c7b08468c09c1d154506fd68cd9069e30118a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54CC 5600 bytes
font_01_sfnt_off000067de.bin
a90f9dd19e61690c1a52467d44d7f558b14a5fa6ce31dc481f77b665486b6896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DE 10560 bytes

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