Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a379d8f6077441…

MALICIOUS

PDF

41.5 KB Created: 2021-05-14 21:03:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 188c6d825716b226707824136f76c5c6 SHA-1: 54c461969da94870ac6570ab1f93f009e56ee440 SHA-256: c8a379d8f60774418aac43a569fa7565a9936b542593bb1a1931b83bac557276
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it links to external URLs, specifically a 'free generator / game hack' lure. The document body, though heavily obfuscated, contains references to 'Free Robux' and the same malicious URL found in the heuristics. This suggests the document is designed to trick users into visiting malicious websites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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.
  • 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/free-robux-ad-game-hack PDF link annotation
    • https://hekl-software.de/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/free-minecraft-skin-creator_GM479516143.pdfIn PDF document text
    • https://hekl-software.de/images/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://hekl-software.de/images/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • https://hekl-software.de/images/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://hekl-software.de/images/www-bandicam-com-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_off0000484c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x484C 27220 bytes
SHA-256: d3ca3bd06cd2f3ba9fb45d5d2cc20e0acb99c08f4f06b9700b6ac4b3e67f2af8
font_01_sfnt_off0000865d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x865D 18188 bytes
SHA-256: 8548f8eac6602b4da1df91b5e613954ee993c39611fc0c0834e4b9af2cb2062a