Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c16b6b3071b3ac0…

MALICIOUS

PDF

45.4 KB Created: 2021-06-04 01:26:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 23bb9d4189ada8ca01ef87034660fe00 SHA-1: 9f29c13413c03d125faca986caa06feec532cd41 SHA-256: 7c16b6b3071b3ac0df1b6362b363aa90d0e8326b174243cc515a6149a33e9737
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as "free generator / game hack" lures. The document body, though partially corrupted, contains references to these lures and embedded URLs. The primary malicious activity observed is the redirection to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/blox-fish-free-robux-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/pubg-uc-at-cheap-price_GM1330123889.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-master-gifts_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
font_00_sfnt_off00005321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5321 26768 bytes
SHA-256: a3848d596a157d71f824400f65192b7cb59f02b2f0974cff5cb1fd392666e637
font_01_sfnt_off00008f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F09 18376 bytes
SHA-256: 833bfe47d36e77ffff594e1188eeee77c72f4d78f65cd820fb361f10e8c51563

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