Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4fb95c1916588f…

MALICIOUS

PDF

42.4 KB Created: 2021-05-17 02:32:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e430f91cfcda5f25da99d8e18b10e950 SHA-1: bc5fbe9b4bd5ce64074c747b2959c1e4ed4c57d7 SHA-256: ca4fb95c1916588f5d6b3c7c01fbe4522e8633a7a8359c6f8bd87d6a97351325
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body, though heavily obfuscated, contains references to 'Coin Master Hack' and the malicious URL, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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/406889139/coin-master-hack-pc-download-game-hack In PDF document text
    • https://heimatverein-oberlangen.de/images/make-free-robux_GM431946152.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://heimatverein-oberlangen.de/images/how-to-hack-roblox-to-get-robux_GM431946152.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_off000049bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49BB 24956 bytes
SHA-256: 393b70cfe7de1acff8f4e5e4989e47d147e1c36465897c48a49296b822989a48
font_01_sfnt_off000082f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F6 18448 bytes
SHA-256: 1a77b19ae755b2674c1484136c2a6f206883130a3eb8aa78e1aa84be95f9bf15

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