Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64429e7c459686c…

MALICIOUS

PDF

42.9 KB Created: 2021-05-15 03:52:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7c459c32e46ab021cdd8e94698f87f97 SHA-1: 7f8b0a901ec497854d63246071ef7bb8186100cd SHA-256: d64429e7c459686cde18c8bdf1d8b18d9a2992e4ac9f88737221cac251057461
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a critical heuristic firing for a game hack lure, directing users to a malicious redirector. This redirector, in turn, points to multiple other PDF files hosted on `mbbs.hr`, suggesting a chain of lures designed to trick users into downloading further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/flip-master-coins-hack-game-hack In PDF document text
    • https://mbbs.hr/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/play-games-for-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/master-game_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-unlimited-spins_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_off00004cb1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CB1 25484 bytes
SHA-256: 06f183feefe8a2400c9896e464275670f0d0c6780f73f5c369773755745ddecc
font_01_sfnt_off0000863c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x863C 18128 bytes
SHA-256: 1c0648f258466a5075bdba4e2dd6a64593ec05e31cc4ebbdb8c2224e9a5c8af7

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