Malicious PDF — malware analysis report

Static analysis result for SHA-256 f620ae36792d4636…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 07:01:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: de8a7b35f2bd1113703248c04c6089be SHA-1: 56eced0c3514b12430213a8527bb2f5d15367829 SHA-256: f620ae36792d4636f1e781bc5e24bc37576b5c1ffc9b50ff3309f3dcb0e8c5be
82 Risk Score

Malware Insights

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

The PDF document contains a lure for game hacks and generators, directing users to a malicious URL. The ML classifier strongly indicated maliciousness, and the presence of multiple game-related lures suggests a social engineering tactic to trick users into downloading potentially harmful content. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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/431946152/free-roblox-injector-game-hack PDF link annotation
    • https://www.cow-style.com.tw/upload/files/free-roblox-account-generatorold-account-spiiltz-rico_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-in-to-roblox-easy-to-learn_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-roblox-promocode-november-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/hack-roblox-link-mad-city_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-coin-master-account_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/01-know-this-free-robux-secret_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-weapon-simolator-hack_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
font_00_sfnt_off00002fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB2 22072 bytes
SHA-256: b005b7b1d415ba868d7774f84d3ca85e7bb2e75110af79b1ee6298c7bdf4038e
font_01_sfnt_off00006094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6094 18944 bytes
SHA-256: a46d9ddbb6334d284056799314f5e85b9d3b171abb92ec665d893bb118be9f5f

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