Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbc0a6376f7a151…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 18:36:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e5019c036cbd45fbeb539964ef8ae1b4 SHA-1: 3c7f289f4703e2f6fd8d879669434b368808c8bc SHA-256: 8fbc0a6376f7a15128ba07089079e99744e80c36730d2244153982b3d0ce9094
162 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, designed to lure users with promises of free game currency or hacks. The primary lure points to a URL associated with 'free robux no verification', indicating a phishing or scam attempt. The document's structure and content strongly suggest it's part of a campaign to drive traffic to these external sites, likely for monetization or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://netcdn.tw/app/431946152/free-robux-no-verification-2021-android-game-hack PDF link annotation
    • http://lib.teknik.unimal.ac.id//repository/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-items-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-free-dominus-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/is-roblox-free-on-computer_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-group-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/cheat-code-super-city-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-hack-no-download-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/robux-for-roblox-free-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-free-robux-buzz_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/raindrop-roblox-hack-download_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
font_00_sfnt_off000030fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30FB 21924 bytes
SHA-256: 176d14f319d3d261d77d83dc942754a2042e75716a49a89edf67febd08f9ba63
font_01_sfnt_off00006182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6182 19648 bytes
SHA-256: fddc38f60f29949e87a17df7f7945f6cf104ea1bd46a51d994ebbbbf43946b8f

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