Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdaf1873ba69c15e…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 17:23:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9af2506601014ad5ca58c8d116786fd8 SHA-1: 7f6b44968347b3cf501628bc00baa5cb4675bad8 SHA-256: cdaf1873ba69c15e28feb3574264b74c31a08a6b12f2c4a05b7183520bd2050a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-risk heuristic indicating it links to a game hack lure, specifically targeting 'Coin Master' and other games. The embedded URL http://netcdn.tw/app/406889139/coin-master-free-shield-link-game-hack is the primary indicator of malicious intent, likely serving as a redirector to a phishing or malware download site. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to trick users into visiting a malicious resource.

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.tw/app/406889139/coin-master-free-shield-link-game-hack PDF link annotation
    • https://au-ma.com/image/data/files/roblox-birthday-invitation-free_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/ww-roblox-cheat-us_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/roblox-hack-for-android-no-survey_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-valid-roblox-promocodes_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/pubg-uc-mongolia_GM1330123889.pdfIn PDF document text
    • https://au-ma.com/image/data/files/fun-and-free-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/can-roblox-detect-hacks_GM431946152.pdfIn PDF document text
    • https://au-ma.com/image/data/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://au-ma.com/image/data/files/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F4 23160 bytes
SHA-256: cea0282478069740b971d049cec4ac1a71d0124137f3a3c740c87722ea2ee1ae
font_01_sfnt_off00006603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6603 18580 bytes
SHA-256: 28ee47efd6c2d2ec5d8d6e69d99c6b14bf9fd67f9a78f80b4c32aabff95defac

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