Malicious PDF — malware analysis report

Static analysis result for SHA-256 271908b891ef47f4…

MALICIOUS

PDF

41.9 KB Created: 2021-05-15 07:43:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8608e97be0d7dac08c9a02b187649f5f SHA-1: 368fb406bb7340b06feae336f1844156fe28fac2 SHA-256: 271908b891ef47f4488c2de88ad5b279162d0aee3a789c3069b070707bf07fd9
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, disguised as free game hacks or generators. The document body, though partially corrupted, contains references to these lures and a primary redirect URL. The ML classifier strongly indicated maliciousness, and the heuristics confirm the use of redirector infrastructure to likely deliver a second-stage payload.

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/479516143/free-multiplayer-minecraft-server-game-hack In PDF document text
    • http://greasley.online/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://greasley.online/images/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • http://greasley.online/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://greasley.online/images/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://greasley.online/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://greasley.online/images/coin-master-heaven-free-spins-today_GM406889139.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_off00004a08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A08 24612 bytes
SHA-256: 07e4abb37a5dccc2f0295ac9b90d268d6df2ce358f13086cc6b4cb01c63049f3
font_01_sfnt_off000081a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A8 18252 bytes
SHA-256: 15432e288a3c492c6d4ea8af11726bc455bd5b0901c9f366813dc1a1d3aad7a5

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