Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbcb2a3662adc87…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 12:11:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b2302992152f110b623a8e49f6399668 SHA-1: 56277d8ab4a0b88fc8e4a167176dd64a5d0050f6 SHA-256: fdbcb2a3662adc87ce8159fc328753a73590719d71fd5e205b11cb9cf800bad9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector disguised as a game hack generator. The primary lure is for 'Coin Master' game hacks, directing users to http://netcdn.tw/app/406889139/coin-master-game-hack-kaise-kare-game-hack. This infrastructure is known for distributing malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-game-hack-kaise-kare-game-hack In PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/roblox-how-to-get-free-gear-2021_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/best-free-roblox-items-exploits_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-likes-for-tiktok_GM835599320.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/roblox-e-free_GM431946152.pdfIn PDF document text
    • https://hotelartskathmandu.com/userfiles/files/tiktok-free-credit_GM835599320.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
font_00_sfnt_off00003128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3128 22796 bytes
SHA-256: 0a3c8cde048ee8a8d0b22ee8f87bd19e7f4101616b208ee7d5120132ec1e5e5b
font_01_sfnt_off0000640c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640C 18264 bytes
SHA-256: a8389fbf181df9705b3255eb4c4696b43f8c72abea2faab980217b88f505b556

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