Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3390366eaf516a…

MALICIOUS

PDF

47.3 KB Created: 2021-05-11 08:32:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9dd1455f63208b24e67fdf7e51295237 SHA-1: ffb3397355307f614303b17019697b2faab3afa6 SHA-256: de3390366eaf516aeeb3cb5e784fb9163334506693d2977d1842710ea6f70fbd
220 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are designed to appear as generators for popular games like Coin Master and Roblox. These links lead to redirectors and further PDF files, indicating a link farm designed to drive traffic to malicious infrastructure. The ML classifier also flagged this PDF as malicious, supporting the observed malicious link patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-ios-app-game-hack In PDF document text
    • http://ims-77.fr/images/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://ims-77.fr/images/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/free-coins-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/www-robux-com_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/robux-offer-wall_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004fb9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB9 25860 bytes
SHA-256: 9880c36a336545e6ea210e7e236b3198df336920640d40c2295d5d38a358ead1
font_01_sfnt_off00008a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A48 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off000097d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97D0 17892 bytes
SHA-256: c18f05485291fd9dd2d982fa815b69c2a1f9afc9df9b250f8ccfc4cbb8514acf

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