Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d726a067de78eb…

MALICIOUS

PDF

43.8 KB Created: 2021-05-20 06:45:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a27fb3da70b844eaebf62ab469e42eec SHA-1: 185b4be9113d3daa39925a9de4bb993ca3f6ebca SHA-256: 55d726a067de78eb6f3d8e0173b779fc222074b9b94c20973b691a7939d3888b
122 Risk Score

Malware Insights

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

The PDF document contains a high-confidence heuristic indicating it's a game hack redirector lure, impersonating Amazon to trick users. The primary malicious link, https://netcdn.xyz/app/835599320/tiktok-free-view-easy-verification-game-hack, is embedded within the document body and also flagged by PDF_URI and PDF_GAME_HACK_REDIRECT_LURE heuristics. While no scripts were extracted, the document's structure and embedded URLs strongly suggest it's designed to lead users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/835599320/tiktok-free-view-easy-verification-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/835599320/tiktok-free-view-easy-verification-game-hack PDF link annotation
    • https://mobile.connecttravel.com.tw/image/data/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/get-roebucks-com_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/pokemon-go-free-xp_GM1094591345.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-connection-lost_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004579.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4579 24704 bytes
SHA-256: b85e429b8e1ef67816ee1cdbe2071a7049669ddd6d902b882b132af8656e6acf
font_01_sfnt_off00007eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBA 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000088a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A5 18160 bytes
SHA-256: 5779170a2ae416b6ac02b73159bc04b1a3277b6095aff79bffcca7fd731900e5