Malicious PDF — malware analysis report

Static analysis result for SHA-256 1840d0a8acf8ed9e…

MALICIOUS

PDF

30.1 KB Created: 2021-07-18 22:56:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a2330628733600cf0d6e3a6343822aee SHA-1: 3082f3634764ac13e5f932e30a55966f5585a91a SHA-256: 1840d0a8acf8ed9ef1c6b521bcd4f0b87ff0cba4c796739bac94931dbfcd974a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack lure, directing users to a known malicious redirector. The embedded URL and document body text reinforce this lure, suggesting the primary goal is to redirect users to a potentially harmful site for further exploitation or scamming. No scripts were extracted, limiting the analysis of further stages.

Machine Learning

  • Nyx PDF Classifier clean score 0.0560

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 http://netcdn.tw/app/406889139/100-free-spins-coin-master-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_002_off00002212.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2212 22592 bytes
SHA-256: 73024ea614a2a23878d3e0520a34e7a0f34d7f1278dbf3123de0037ef7967686
font_01_sfnt_off0000549b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x549B 18164 bytes
SHA-256: 9bc61af2acbda784231945e40c4a4bb5d6810b0d04641be6b37b2cdd3c5b78bc

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