Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1dba08e6902151…

MALICIOUS

PDF

34.2 KB Created: 2021-07-20 13:54:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8c58eedad535d5eaecbf0c9b8d46e53f SHA-1: b8dbe85526f32d9ffe45c5409f1574ce04581dc4 SHA-256: ca1dba08e69021518b1e59e0fe36fcd6975b8d0e73b2a460492fb2450834b0d5
82 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to URLs promising free game mods and hacks, such as 'http://netcdn.tw/app/479516143/free-minecraft-mods-game-hack'. This lure is a common tactic to trick users into downloading malicious payloads or visiting phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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/479516143/free-minecraft-mods-game-hack PDF link annotation
    • https://dientubentre.com/public/upload/files/tiktok-free-views_GM835599320.pdfIn PDF document text
    • https://dientubentre.com/public/upload/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://dientubentre.com/public/upload/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://dientubentre.com/public/upload/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://dientubentre.com/public/upload/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://dientubentre.com/public/upload/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://dientubentre.com/public/upload/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://dientubentre.com/public/upload/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://dientubentre.com/public/upload/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://dientubentre.com/public/upload/files/minecraft-free-download-android_GM479516143.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_off0000331c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x331C 22528 bytes
SHA-256: 07e5961e4e23eb84043fae7848e5f457714f99d40e9fc22ac25b859f6faffefe
font_01_sfnt_off00006521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6521 17884 bytes
SHA-256: adaa6c4c94b3243dd254ffbddf76305537cf905bb6459c29a6343236798c761b

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