Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabf3f6d674d5b36…

MALICIOUS

PDF

45.0 KB Created: 2021-05-14 10:03:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2950bbd9b4fe343c126ac22e61379846 SHA-1: 82cc42781683ea95af321fa55d34432af27bc25d SHA-256: cabf3f6d674d5b360da78909d89660c4a2162b8895c5ba3d815b5802d7a37730
82 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs that lead to websites promising free in-game currency or hacks, such as 'robuxmatch-com-free-robux-game-hack'. This strongly suggests a social engineering lure designed to trick users into visiting potentially malicious sites. The ML classifier also flagged this PDF as malicious, increasing confidence in its harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 https://netcdn.xyz/app/431946152/robuxmatch-com-free-robux-game-hack PDF link annotation
    • https://www.gymun.cz/images/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/rbx-com_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-game-free_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-800-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-free-coins-today_GM406889139.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_off0000479c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x479C 25304 bytes
SHA-256: de6a72c92e5162aaba36e6ea2a5df8676389022c19e2920b443ca32bed2a4476
font_01_sfnt_off00008222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8222 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD3 18772 bytes
SHA-256: ef8253bc9c644a400764ba46849deadc1c414499c30f017f83fef73bbdfbe327

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