Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0f415b39e4bafc…

MALICIOUS

PDF

34.6 KB Created: 2021-07-19 19:30:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8c0e3e90b433967e67f9c7fdcfa3d00c SHA-1: 1096ad937cde9105ef6eea0b73a1cdb35a669754 SHA-256: 1a0f415b39e4bafccecc0798f8563c52d6c6242232b29243d8b7839b04605724
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a heuristic firing for a 'game hack' redirector, strongly suggesting a lure for users seeking free in-game currency or cheats. The document body, though partially corrupted, contains text related to 'Coin Master Free Spins' and a call to action, reinforcing the lure. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-free-spins-link-today-new-game-hack, which likely leads to a phishing page or a payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-spins-link-today-new-game-hack PDF link annotation
    • https://helsoft.se/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://helsoft.se/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://helsoft.se/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://helsoft.se/images/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://helsoft.se/images/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • https://helsoft.se/images/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://helsoft.se/images/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://helsoft.se/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://helsoft.se/images/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://helsoft.se/images/free-tiktok-app_GM835599320.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_off00002f78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F78 23376 bytes
SHA-256: 4f22108a6e1ad4d5443508a3276e312c7cbf45c673df5491a4ba32cf33846ef0
font_01_sfnt_off00006458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6458 18572 bytes
SHA-256: 51c95658009ee6a6ae875a8d4133a79c51d36fbd34bac1203a2f2fe060da7c96

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