Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b409f00bd3aaad9…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 05:04:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1242392ba687029c12b87754b565362c SHA-1: a7eda2214d55ed2bd111d331667e8d09b61cda86 SHA-256: 9b409f00bd3aaad93ad6023af4558adf0fa45670a10f86844c0d2b6d8f353e95
180 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector, disguised as game cheat generators. The primary link directs to 'https://netcdn.online/app/406889139/cheat-codes-for-coin-master-game-hack', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to game hacks and potentially a callback lure, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/cheat-codes-for-coin-master-game-hack In PDF document text
    • http://library.umla.ac.id//repository/pubg-uc-to-pkr_GM1330123889.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-and-spin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/pokemon-go-free-download-hack_GM1094591345.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-2021-free-spins-link-blogspot_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_004_off0000531a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x531A 24908 bytes
SHA-256: 7401cfc94320d5e7ae912fb31b35273370efe037358dccffc72b7b81c9ae426b
font_01_sfnt_off00008b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B11 18052 bytes
SHA-256: c83c2968f9adc9e8284b9f918c7c7a0f7d3bbc65ccd05c6284fac2f5c017bb12

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