Malicious PDF — malware analysis report

Static analysis result for SHA-256 552e8a25489fc63f…

MALICIOUS

PDF

35.5 KB Created: 2021-06-27 05:44:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1fb91a55ac73b44bc7f307de17d1d407 SHA-1: d1b6ba338c4f851ed93051637a6de848923ef4fe SHA-256: 552e8a25489fc63f11e18876efdbff4d456e80c0af290fa2e8b073f67f220a03
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are disguised as game hacks or generators for popular games like Roblox. The primary lure is the promise of 'free Robux', a common tactic in online scams. The document body and heuristic firings confirm this lure, directing users to URLs like http://netcdn.co/app/431946152/how-to-get-robux-for-free-2021-game-hack, which likely leads to a phishing page or malware download. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/how-to-get-robux-for-free-2021-game-hack PDF link annotation
    • http://ferienwohnung-walker.de/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/fort-hood-texas-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/free-promo-codes-roblox-may-2021_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/how-to-get-free-robux-javascript-2021_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/robux-game_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/inf-jump-hack-roblox_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/dungeon-life-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/coin-mster-free_GM406889139.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/free-codes-for-roblox-lazer-knife-for-twisted-murderer_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/noxplayer-speed-hack-roblox_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/client-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/just-create-free-robux_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/hacks-for-ninja-legends-roblox_GM431946152.pdfIn PDF document text
    • http://ferienwohnung-walker.de/images/www-roblox-com-catalog-free_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_002_off0000315f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x315F 22856 bytes
SHA-256: 4a11249dee90315341891d9b9a1db2399de4376704122d6bd3d79ff21364afd7
font_01_sfnt_off00006477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6477 19384 bytes
SHA-256: de28a66561f48ef455a7e74c3d38ef737581a70ecb9f32033b07134a01356d69

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