Malicious PDF — malware analysis report

Static analysis result for SHA-256 737b04b9cd039faf…

MALICIOUS

PDF

45.5 KB Created: 2021-05-13 04:28:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 441d94153ba5d633687e1a567c1241e5 SHA-1: e20480c16a4183a26bc2a5aae41dd34638994559 SHA-256: 737b04b9cd039faff740f66193002594e9461b0dbe80dee6b73b9758fd50d285
200 Risk Score

Malware Insights

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

This PDF document employs a common lure of free game hacks and currency to trick users into clicking malicious links. The document displays a fake CAPTCHA, a tactic to coerce users into interacting further. The embedded URLs lead to known malicious redirectors, likely serving as a gateway to further malicious content or exploits. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • 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.
  • 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/how-to-get-free-unlimited-coins-in-coin-master-game-hack In PDF document text
    • https://dirigentigiustizia.it/images/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-free-link-daily_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_off000048bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48BC 25296 bytes
SHA-256: 1777d74a1fb7fbb7dd48666fbe7e94677f7769060b9adf97332ced7f6387a471
font_01_sfnt_off00008372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8372 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9B 18568 bytes
SHA-256: 17c3bfe6e2b09087d9b288dc5214e8ea6d8a39f73936503e3f6998c4d0212d6e

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