Malicious PDF — malware analysis report

Static analysis result for SHA-256 838a56472da0d347…

MALICIOUS

PDF

33.9 KB Created: 2021-07-20 00:21:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 21ed67720d55560197304a0b16f3b5c8 SHA-1: 6c0a42c3ee5254b5088f11a1911076c6dc80ad28 SHA-256: 838a56472da0d347620f84981cded0bca68cf32e5fa45116e85c98bbc194be5b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 4

  • 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.
  • 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/835599320/free-tiktok-coins-game-hack PDF link annotation
    • https://w-i-r.de/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://w-i-r.de/images/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://w-i-r.de/images/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • https://w-i-r.de/images/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • https://w-i-r.de/images/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • https://w-i-r.de/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://w-i-r.de/images/free-fans-on-tiktok_GM835599320.pdfIn PDF document text
    • https://w-i-r.de/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://w-i-r.de/images/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://w-i-r.de/images/coin-master-free-soins_GM406889139.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_off000030c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C7 23200 bytes
SHA-256: 83b5f1c43ee357c8b0ad0b4ca46333f4ab473b711719792db420e2c0a8934c94
font_01_sfnt_off00006529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6529 17456 bytes
SHA-256: af63c3f67091ff5b4163c7a95634870b81efad78e40c2266e63b82bf422718e0

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