Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bf2190102cf4e8…

MALICIOUS

PDF

31.0 KB Created: 2021-07-19 15:31:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a9a01d8564e90cf33f1b232f477baa63 SHA-1: 70c82f84e8acbcdd0d1dc71ecd370165b374ca6a SHA-256: 41bf2190102cf4e82a868fa86930ceb4198f439a15a19d970f4c8f9758c849b9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically identified as malicious. The document body and embedded links suggest a lure for free game hacks or generators, which is a common social engineering tactic. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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/835599320/is-tiktok-free-game-hack In PDF document text
    • http://keepcasscountybeautiful.com/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://keepcasscountybeautiful.com/images/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://keepcasscountybeautiful.com/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://keepcasscountybeautiful.com/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://keepcasscountybeautiful.com/images/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://keepcasscountybeautiful.com/images/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://keepcasscountybeautiful.com/images/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://keepcasscountybeautiful.com/images/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://keepcasscountybeautiful.com/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://keepcasscountybeautiful.com/images/can-you-make-a-minecraft-server-for-free_GM479516143.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
font_00_sfnt_off000029cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29CC 21704 bytes
SHA-256: a408f8648cb2b4df81801289c68f9dfb3ee433abf8e093283eb8b8f2c8736884
font_01_sfnt_off0000598b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x598B 17456 bytes
SHA-256: 9ac98d03116b0178d2440c8519b51994e916559904e102c6f95e7069a9c516c8

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