Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6ac04ff7ee5eff…

MALICIOUS

PDF

45.6 KB Created: 2021-05-17 18:14:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 45782ff7af23444c623067259b027add SHA-1: 21bc5e6f1b0437953b129847c36185c2ba4fc067 SHA-256: 5b6ac04ff7ee5effb72cc8a5f99bd9b8500df441025934422ba97571d097bdef
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9507

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 https://netcdn.xyz/app/406889139/20210-free-spin-links-for-coin-master-game-hack PDF link annotation
    • https://cogp.greentrade.org.tw/image/data/files/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/robux-no-survey_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/robux-download_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/collect-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/ww-roblox-come_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/is-coin-master-free_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-get-minecraft-for-free-ios_GM479516143.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_off00004ac2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC2 25208 bytes
SHA-256: ffbaac9148d870a37baebfad9d28a457618a88d7cde47d9485623b187fb8aeb5
font_01_sfnt_off0000855c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x855C 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0D 18456 bytes
SHA-256: 0c2189e6946270650e490ca98f5793093c0c1550cf94812332a81fc346291d18

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