Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1db10805b11baf…

MALICIOUS

PDF

42.3 KB Created: 2021-05-16 07:09:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 12a82d802eb062a846e07bdd821f4972 SHA-1: 80fbab89a26dc3a72efe1231014d50b8eb9718db SHA-256: 4b1db10805b11bafbbe8cb2e1b9a28ac2bbc8ad4075acd2444e5ad251d2fbf9c
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 0.9971

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: https://netcdn.xyz/app/406889139/coin-master-hack-mod-apk-free-download-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 https://netcdn.xyz/app/406889139/coin-master-hack-mod-apk-free-download-game-hack PDF link annotation
    • https://allpromise.com.tw/image/data/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-links-to-free-spins_GM406889139.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_off000049b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B5 24664 bytes
SHA-256: e2837bb7c30b22aeee34d7d7bb54f857254478a487da19ec85e53857536abb91
font_01_sfnt_off00008214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8214 18636 bytes
SHA-256: f35a088bb389889b7dbdb2955ea981e64c4ac43926c2f49735e1909520ee0b52

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