Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fddcb974920272…

MALICIOUS

PDF

35.4 KB Created: 2021-06-30 16:51:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4ffa9b1812b2c7b7033c48079bb5b090 SHA-1: f08cd88fcf92d9dce22588b6ff0ea6aaae18d865 SHA-256: 39fddcb974920272f0e82670e9cfaad96c73770b20b2f255aa1de6ac40fd2c5d
200 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' which redirects to a malicious URL. It also displays a fake CAPTCHA or human verification prompt to trick users into interacting with the malicious link. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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
  • 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 http://netcdn.co/app/431946152/how-to-hack-into-ants-roblox-account-game-hack In PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/claim-your-free-roblox-game_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/go-thru-walls-roblox-jailbreak-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/hack-de-roblox-de-robux_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/greenlegocats123-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-jailbreak-hack-mobile_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/exploit-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-robux-no-human-verification-required_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-hack-work-at-a-pizza-place-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-robux-deals_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-get-free-robux-on-ipad-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/robux-hacks-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-be-naked-on-roblox-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-pokemon-free-play_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/download-free-cool-roblox-boy-outfits_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-hack-roblox-on-android-tablet_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-get-instant-free-robux_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_off000031e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E1 22880 bytes
SHA-256: b9104c33dd6203725a4c4d3bdae11dc4d57ea93ed3a0ca066764dd849661688a
font_01_sfnt_off00006517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6517 19064 bytes
SHA-256: 6143d637c5c84f1ee889a3439d0dd00a3f16050939b2be59eff2cb0ea2cf8b24

Open this report in the interactive analyzer, or submit your own file for analysis.