Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f08b1f5e31ce9fe…

MALICIOUS

PDF

46.4 KB Created: 2021-05-16 06:30:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 710315731ad7e4f2c82d46ec493a89a0 SHA-1: 532cbe32381a8075e7fc4af1ffe3f00a79881c37 SHA-256: 3f08b1f5e31ce9feb04844e22b96b05d8cc52d45a7998806188f79e486ffd026
260 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are part of a link farm designed to attract users searching for game hacks and cheats. The document body and heuristics indicate a lure for 'Coin Master Hack' and 'free Robux', presenting a fake CAPTCHA or verification prompt to trick users into clicking malicious links. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-hack-without-verification-code-game-hack, which is likely a redirector to further malicious content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-without-verification-code-game-hack In PDF document text
    • https://alarmed.pl/images/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://alarmed.pl/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://alarmed.pl/images/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://alarmed.pl/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://alarmed.pl/images/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • https://alarmed.pl/images/coin-game_GM406889139.pdfIn PDF document text
    • https://alarmed.pl/images/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • https://alarmed.pl/images/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://alarmed.pl/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://alarmed.pl/images/is-it-possible-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://alarmed.pl/images/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://alarmed.pl/images/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://alarmed.pl/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://alarmed.pl/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://alarmed.pl/images/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://alarmed.pl/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://alarmed.pl/images/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://alarmed.pl/images/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • https://alarmed.pl/images/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • https://alarmed.pl/images/tryrbx-site-free-robux_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_off00004cb9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CB9 26008 bytes
SHA-256: bdcd2af653530bfc95d3ceb50def1a33069089c5e7ceacc2d472e2debf6ec9e9
font_01_sfnt_off00008714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8714 3124 bytes
SHA-256: 9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98
font_02_sfnt_off000091f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91F2 18528 bytes
SHA-256: 73698aa0d04f612b8edcfc98417ef0f8be184b3e572c91f5f0109cbf791ef469

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