Malicious PDF — malware analysis report

Static analysis result for SHA-256 33021dcbbd1a7234…

MALICIOUS

PDF

49.3 KB Created: 2021-06-09 07:45:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1952399a9f608d646d3488cdc04c5d4a SHA-1: 07db754b2df74f8e2524a6bee894d083152b350c SHA-256: 33021dcbbd1a7234212ac765af890106b44da544ab82f4e63b76d49dba1791d3
220 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a game hack generator, likely intended to trick users into downloading further malware or visiting a phishing site. The presence of a fake CAPTCHA lure reinforces the social engineering aspect of this attack. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a client-side execution vector, potentially leveraging JavaScript or other embedded exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/hacks-in-bee-swarm-simulator-roblox-game-hack In PDF document text
    • http://digilibfisip.uwks.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/robux-codes-2021-free_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/como-usar-hacks-en-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/how-to-hack-a-roblox-account-on-phone_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/free-account-in-roblox-password-and-username_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/cache-http-thebuxiancom-howtogetfreerobuxonroblox_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.uwks.ac.id/repository/free-spins-and-coins-on-coin-master_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_off000051c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C6 32156 bytes
SHA-256: e280e0032199a81d2e6133b86119d7079767a4a204a364544ec2f166c4a921fe
font_01_sfnt_off00009c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C89 18968 bytes
SHA-256: a04930678d8f63d93b7da8784b48e3db1787c49b4fd5154a14de353cfa1f746e

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