Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b93ccf6a76b297…

MALICIOUS

PDF

42.7 KB Created: 2021-05-14 17:06:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: eceec1d9ab79844738ad751f4796a031 SHA-1: 438997d9dfa4a1d61978f3ff688cfe6e14376ad3 SHA-256: 81b93ccf6a76b29725280d74db4b3b3c99d8ef5ab4225da58bec8462a7628a74
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 0.9971

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/431946152/free-robux-giveaway-game-hack PDF link annotation
    • https://photographygroupofbunbury.com/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/free-robux-videos_GM431946152.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/get-robux-com_GM431946152.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/www-robux-redeem_GM431946152.pdfIn PDF document text
    • https://photographygroupofbunbury.com/images/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A16 24904 bytes
SHA-256: 8db018badde92230adb8673c836c61dcfe4c3065519526df3d0cd84324a77540
font_01_sfnt_off000082ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82AE 18820 bytes
SHA-256: a907981f6338d23acda294c558170907db38f399f16fdb2ca0bc536a0b707f6d

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