Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf94351eedeeabb2…

MALICIOUS

PDF

42.6 KB Created: 2021-05-17 23:20:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 36fc71f33e9aac5a4a53b35a4122246a SHA-1: 87c28460dfdf2638f22da9d094c269a4b420072b SHA-256: cf94351eedeeabb2ab94bda078b88bcc5cef85b8bf17f95151bcf07b26e97822
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting "game hacks" and "free generators" for popular games. The primary lure directs users to `https://netcdn.xyz/app/431946152/roblox-free-hats-game-hack`, which is flagged as malicious. The document body, though partially corrupted, contains similar URLs and text related to game exploits, reinforcing the phishing and redirection attempt.

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 https://netcdn.xyz/app/431946152/roblox-free-hats-game-hack In PDF document text
    • http://zercalo.org/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-domain_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
stream_003_off0000495b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x495B 25684 bytes
SHA-256: 00eb8a9427033853ff56f2939c83281428f53b8d2fcf07ef02754752a6803ec7
font_01_sfnt_off0000840e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x840E 18280 bytes
SHA-256: d79b24007103f0b8771e10b039c1f7207970f223f4181a99123e56d5497ad133

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