Malicious PDF — malware analysis report

Static analysis result for SHA-256 09836527423a60b7…

MALICIOUS

PDF

34.8 KB Created: 2021-07-19 18:10:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2988385674c117d84264dbedfd2ea550 SHA-1: 1d230516000abc9a355a2e0146f13c885c33a5b3 SHA-256: 09836527423a60b76519c0547b0b02bcdedb98c4590dd58afeae97599c2a5c7c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to redirector domains, specifically advertising 'free generators' for games like Coin Master and Robux. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-game-hack, which is flagged as malicious. The document body also contains a call to action to access a 'Coin Master Generator'. This indicates a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-free-game-hack In PDF document text
    • http://solidkom.ch/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://solidkom.ch/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://solidkom.ch/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://solidkom.ch/images/free-robux-hacker-us_GM431946152.pdfIn 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_off00003423.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3423 23132 bytes
SHA-256: 3a486f5ba293e43131f35115a9a4fdf5acf8b01f6689aa369885885f888c2e85
font_01_sfnt_off00006815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6815 17712 bytes
SHA-256: 0afd6f2792edb83b7f2a0201a1e0a5eb12ca81ad868fb3e42742340ee6e5fb0e

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