Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf53019c6db6815…

MALICIOUS

PDF

45.3 KB Created: 2021-05-17 21:01:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e81381c97c12e7d97638a04047c20877 SHA-1: 80bd95da3329b64605f0b9ef5313caf97f91346a SHA-256: 9cf53019c6db68156edf07fea6cf07afebce8de63cdb867ebc409578ad1bab97
200 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a 'free generator / game hack' lure, which also presents a fake CAPTCHA to trick users. The document body and embedded links suggest an attempt to drive users to potentially malicious websites for scams or further malware delivery. No scripts were extracted, but the PDF structure and heuristics indicate a clear intent to exploit user interaction via deceptive content.

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 https://netcdn.xyz/app/431946152/free-robux-no-verification-or-survey-2021-game-hack In PDF document text
    • http://ratchadatitan.com/UserFiles/File/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/rbxdemon_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/cm-spins_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/fb-coin-master_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/op-rewards-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
stream_003_off00004c76.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C76 28124 bytes
SHA-256: 7f8f7e588c4326a2784455b3584a31733faab47f096a30ab7505eb9e290aebe3
font_01_sfnt_off00008bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB3 19296 bytes
SHA-256: 8ae3a64377bb3499e06ef2dc6ba5ce98d8bac2a4cf46517fa6b68a3eec67b541

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