Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8dab2f4517c69b…

MALICIOUS

PDF

41.9 KB Created: 2021-05-15 15:38:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1ae3a3c89988f647049184b55581ca64 SHA-1: 5e13185b31ce8f9e36db515c8a8a5573ba06067e SHA-256: fd8dab2f4517c69ba98a42cde9d6a5d530359df723fa28799c8fbe00b4f40d06
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks and generators. The primary lure URL is https://netcdn.xyz/app/406889139/coin-master-free-spin-facebook-link-game-hack, which is associated with known malicious redirectors. The document body, though heavily obfuscated, contains references to game hacks and generators, reinforcing the lure. No scripts were extracted, but the embedded links are the primary mechanism for delivering the malicious 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/406889139/coin-master-free-spin-facebook-link-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/master-free-spin-and-coin-link_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_off00004731.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4731 25212 bytes
SHA-256: f6aba902bbf02776104a7976105808a666c3c5dc73588a1218958ea46647c5da
font_01_sfnt_off00008179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8179 18212 bytes
SHA-256: a7d0484bdc545634c9b46f4dcbf794c30064c3aaaf3cdd537b213ac19f08a95c

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