Malicious PDF — malware analysis report

Static analysis result for SHA-256 9895e1be113d7649…

MALICIOUS

PDF

51.1 KB Created: 2021-06-03 22:22:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3d7e4f086c17e7f253df3922aac6b864 SHA-1: f2ca49bdb0233f5cf07f2e1bb658e8328b8e7327 SHA-256: 9895e1be113d7649953e26778fe2f51c3b5f7397d485330c16ee91d1903df5d9
220 Risk Score

Malware Insights

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

This PDF document employs a lure for a "Free Robux Generator" while impersonating PayPal, indicating a likely credential phishing or malware distribution attempt. The document contains multiple links to external URLs, including a primary redirector at `https://netcdn.online/app/431946152/free-robux-generator-no-survey-no-download-no-human-verification-game-hack`, which is flagged as malicious. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/free-robux-generator-no-survey-no-download-no-human-verification-game-hack.
  • 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-generator-no-survey-no-download-no-human-verification-game-hack In PDF document text
    • http://perpus.stihpada.ac.id/repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/www-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/hacked-client-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/tiktok-unicorn-free-download_GM835599320.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-free-spins-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_004_off000052f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F8 28340 bytes
SHA-256: 645e30de51ddfece5eb0736a7b90085c90fd1d2206b46040aaf908aa21a663c7
font_01_sfnt_off00009461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9461 3884 bytes
SHA-256: 64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29
font_02_sfnt_off0000a108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA108 19736 bytes
SHA-256: 3cea6d4f9da734904bcc55369e0b79f4621aa36195ab65246c463812034b9480