Malicious PDF — malware analysis report

Static analysis result for SHA-256 2746107be3a04ee8…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 14:08:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4cba5d9d07985f9d27fbda310ccc5df0 SHA-1: 251b8ec840f7da6c14295e990bef11718b85ea44 SHA-256: 2746107be3a04ee869a305985016df776dfaf2fa224835b16f027956d313b32d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links pointing to a known malicious redirector infrastructure, specifically advertising 'Coin Master 2021 Free Spins Link Game Hack'. This indicates a social engineering lure designed to trick users into visiting a compromised site, likely to download further malware or engage in phishing. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/406889139/coin-master-2021-free-spins-link-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/can-i-have-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-spins-coin-master-no-verification_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_004_off000050e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E0 29332 bytes
SHA-256: 23e66de1db623a7aada2b897fccc71896f55fc41cf9094e083b15702f669a117
font_01_sfnt_off00008ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ECF 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9882 18456 bytes
SHA-256: b370a5eafdfb7958c61f4fc883d4c28be8b0b06276da4480d394e4923f22f18f

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