Malicious PDF — malware analysis report

Static analysis result for SHA-256 6373cd7e4ffd9c3c…

MALICIOUS

PDF

36.9 KB Created: 2021-05-24 13:12:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2b2518a8ee05f006b5d727ad6e82f0fa SHA-1: 311a0547a9ab1860ff4350469ddefac0a5a91f97 SHA-256: 6373cd7e4ffd9c3c2fd59cd07de3eacc146e56f2d16cba356e966f454dacfe7b
122 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'free Robux' and impersonates eBay, directing users to a malicious URL. The ML classifier strongly indicated maliciousness, and the PDF_GAME_HACK_REDIRECT_LURE heuristic confirms the presence of a game hack redirect. While no scripts were extracted, the document's structure and embedded links suggest it's designed to lead users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/promo-codes-for-free-robux-game-hack.
  • 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 https://netcdn.xyz/app/431946152/promo-codes-for-free-robux-game-hack PDF link annotation
    • http://halle-wasserball.de/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://halle-wasserball.de/images/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://direct-link.netIn 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_002_off00003240.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3240 25972 bytes
SHA-256: 032506cf9e9964c61930308d9936bed40a358a66456aad89b9ce5b97d38359a7
font_01_sfnt_off00006e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E37 18604 bytes
SHA-256: 79f1ed749ebb86ed8378b1cb9aa6f559fb500c5101e3810faa0ee40136890037

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