Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb318ff9ceae668…

MALICIOUS

PDF

47.2 KB Created: 2021-05-11 17:07:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d67b199778b40128d84936fe0d87849e SHA-1: 68fd7296a02aa92ee17d899d2a05d9e116f96351 SHA-256: 6fb318ff9ceae66895455ba313e3db42808a4da16ae0521992d7c43bce7fff54
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and lures users with promises of free Robux and game hacks. The document body, though partially corrupted, also contains embedded URLs that point to these malicious sites. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/get-free-robux-game-hack In PDF document text
    • http://stroygrad-spb.com/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://stroygrad-spb.com/images/earn-robux_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/get-free-robux-info_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_off00004aab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AAB 28628 bytes
SHA-256: 996ae4e8a03ddbe1a3b437e17e3eb0ba2e1c2dfba83422f172acb481e62f2315
font_01_sfnt_off00008c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C91 2908 bytes
SHA-256: e28d2c57f35643e2026f86c34ac3bb63cba74be3f6c066e81aba6d285e5a121b
font_02_sfnt_off0000968b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x968B 18120 bytes
SHA-256: 79ac164380d838bf2943c127f808202d45f8751c05dbd036140e6fb9b1b49848

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