Malicious PDF — malware analysis report

Static analysis result for SHA-256 da62042135a9dd38…

MALICIOUS

PDF

36.3 KB Created: 2021-05-15 23:33:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d353ab49c23d9f2aa08b550eab509ae7 SHA-1: 4e2b7a6133754fce90d3f6077c2af70c3f6a69f5 SHA-256: da62042135a9dd38c6a5f7b0aa2b091ecd50a7562f2095aa4e578fb34def9ae2
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'Coin Master Hack Online' lure. This link is designed to trick users into downloading potentially malicious software or visiting scam websites. The document body and metadata confirm the use of wkhtmltopdf, and the presence of a benign Wikipedia link does not negate the malicious intent indicated by the primary URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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
  • 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://netcdn.xyz/app/406889139/coin-master-hack-online-android-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003321.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3321 25084 bytes
SHA-256: cb912d7138d0a74c641c566ab8e88366822ece4b48d9e3072b45c5044636e8a9
font_01_sfnt_off00006d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8F 17964 bytes
SHA-256: e085c742a6298e55fcde9a217167edad0f2b0c01ff8e5715ed5b8bb288dc9136

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