Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b53595b9e602bb…

MALICIOUS

PDF

45.2 KB Created: 2021-05-17 20:06:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b8903cdaefbaaada7560e5d449386241 SHA-1: 34a062c16aedfd2ea9b7379d93e42864c1de3e9e SHA-256: f2b53595b9e602bbff340d69dea89126b3c1edd02575f5767eaab4ff02eae376
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a lure for game hacks and free currency, directly requesting sensitive information such as recovery secrets or private keys. It contains multiple embedded URLs, including a known malicious redirector at `https://netcdn.xyz/app/406889139/coin-master-free-spin-today-game-hack`, which likely leads to further malicious content or phishing pages. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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-today-game-hack In PDF document text
    • https://www.croydex.com/uploads/files/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-rules_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-pins_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/mcpe-free-download_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/www-roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-15-free-spin-link-today_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_off00004bf7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BF7 24580 bytes
SHA-256: 52f2fdcfd1838677ad8f5f3201fe4c5f502adce1cc3b78df15fe9e06b248b294
font_01_sfnt_off0000844a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x844A 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E35 18240 bytes
SHA-256: a96ac7afd25cadbabafd1b9dbf0a180d0c1833ed2d07acb4363f122556c39d20

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