Malicious PDF — malware analysis report

Static analysis result for SHA-256 952f66b2f05b50ea…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 05:57:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4caa0944678f0ea494ae2fb7adedbc3e SHA-1: 9d36182e1b85def153c3912f73ee85f355c1f91c SHA-256: 952f66b2f05b50ead0834806f728c43c39cfdea86edd3219ff1b0addc42f453b
180 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirector infrastructure, disguised as 'game hack' generators. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the primary malicious URL, suggesting a lure to download or execute further malicious content. The presence of embedded URLs and the nature of the lures point towards a phishing or social engineering attack.

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/431946152/is-it-illegal-to-hack-robux-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/tiktok-free-840-apk_GM835599320.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-group_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/well-hack-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/is-tiktok-free-to-download-on-iphone_GM835599320.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-no-verification-no-survey_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_off000050f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F2 25112 bytes
SHA-256: edabfce4ff908e74f445dacbf6ce8777bc41cbf5d9fedb2b8abc516efde5af82
font_01_sfnt_off00008b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B28 18712 bytes
SHA-256: 19a941866f3784d46105ae85613fe0ebdeb9e0e2019ec2faecceafef975da6c8

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