Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f998c9e2c9b60e1…

MALICIOUS

PDF

43.3 KB Created: 2021-05-20 05:31:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8804b6d2841a3305ae51041d25d4bb78 SHA-1: 1967b5bec8d6812923f3ab12bde1c7de5b4bef3b SHA-256: 7f998c9e2c9b60e1c86669bc042b0709215f17de3f1156898757127d1f065909
220 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, such as the one pointing to 'netcdn.xyz'. This pattern is consistent with phishing or scam campaigns aiming to redirect users to potentially harmful websites or download further malware. The document body and heuristics indicate a focus on game-related lures like 'free generators' and 'game hacks'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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.xyz/app/431946152/how-to-hack-roblox-accounts-on-phone-2021-game-hack In PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/demon-roblox_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/xray-hack_GM479516143.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/what-is-robux_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-hacks-2021_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_002_off000041c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41C7 24552 bytes
SHA-256: cbbb0285ca519612d8a09efc423f8d0a1537e8035a679b57d7e245933f3bd06c
font_01_sfnt_off00007996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7996 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off000083a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A6 19312 bytes
SHA-256: ee3ccdf346fecf17211ec9caf874d857695d657b5f92e2b1f0fe00576c016ffb

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