Malicious PDF — malware analysis report

Static analysis result for SHA-256 4351f758da0d0558…

MALICIOUS

PDF

46.1 KB Created: 2021-06-11 05:59:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c8d5a54067cdf1ed9cfa363fae464cd0 SHA-1: 6eeff430e77bf2311ffed1e6073d4a6a91ca334b SHA-256: 4351f758da0d055895984790184d400288c4aa618e282e93b86966d99ddb670b
200 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing indicating it links to a malicious redirector disguised as a free game hack generator. It also displays a fake CAPTCHA, a common social engineering tactic to trick users into interacting with malicious links. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/flames-free-robux-game-hack In PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-how-to-get-free-robux-real_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/robux-free-account_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-roblox-download-no-virus_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-roblox-promo-codes-not-expired_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/los-mejores-hacks-nuevo-en-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-roblox-forums_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/keyword-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-studio-free-online_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/lingojam-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/robux-hack-code_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-without-phone-number_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-easy-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/cheat-engine-roblox-youtube_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-free-robux-2021-kazok_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-robux-hack-console_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/gear-hack-roblox-building_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/follow-people-inyo-roblox-games-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-pets-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/hack-roblox-speed_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fbe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FBE 28344 bytes
SHA-256: d2dbac0ff46b2fe3676633c10966d0f59c36e17a0f9c059dc7e2d2fd1e40d466
font_01_sfnt_off000090ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90EF 18576 bytes
SHA-256: 6208a73690e0269f6f637a55d6b729b9dc692fa3afc7052398b6b3c14cc5949e

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