Malicious PDF — malware analysis report

Static analysis result for SHA-256 77878df58deba64d…

MALICIOUS

PDF

43.4 KB Created: 2021-06-14 00:20:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 56fea820a3247ff5306678aad602621f SHA-1: a97da90d45f78497957c59a4963e5e060d805b01 SHA-256: 77878df58deba64d14c46d1f819eb2283806714b8a7513e2c43af863967a8c7c
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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: http://netcdn.co/app/431946152/roblox-treasure-hunt-simulator-coin-hack-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 http://netcdn.co/app/431946152/roblox-treasure-hunt-simulator-coin-hack-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/pokemon-go-free-map_GM1094591345.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-a-free-face-in-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/robux-redeem_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/minecraft-client-download_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-re_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-generator-no-human-verification-or-survey-2021_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_off00004b35.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B35 25224 bytes
SHA-256: 2b1d2acb54f54a7eddeabf72ae82e5d9670000409039e278256aaaf57b242023
font_01_sfnt_off000085d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D2 18808 bytes
SHA-256: 77a15c7b520d5c3df7ac3f7836921962a33445874fc968d7b699f80b17c0d9ac

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