Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3c63d4c20bef82…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 09:10:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8fd9d19c9ca7949c442289fdb8afa9b6 SHA-1: 62f30841237fdd02d12339d7c7b8bb792d4a47c1 SHA-256: ca3c63d4c20bef820634e646de5370c7a51e25eaa3040f7f1849f11519460240
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a 'free generator / game hack' lure, which redirects to a known malicious domain. This pattern is consistent with phishing attempts to trick users into visiting malicious websites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/free-robux-thumbnail-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/pokemon-go-free-zekrom_GM1094591345.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-hack-me_GM431946152.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_off000051a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A8 27688 bytes
SHA-256: 4a40b3f49881ab5f0ea9476b13f8bdd833d90925896ff034b12d0a3b92cb88a5
font_01_sfnt_off00008ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF0 18864 bytes
SHA-256: c969eb26f29950990ddccbf0eeab0a7af3119d1c9c7ebc0fee97903357bc58cd

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