Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a796261f9a0e33…

MALICIOUS

PDF

45.7 KB Created: 2021-05-17 07:35:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 97a3f269f02e73c5f3d265945b5639ba SHA-1: 62189b156785708c5ac948464af57824565555b9 SHA-256: d7a796261f9a0e3347a3254a380d15ee4ac0055b3ca2f536659e628351bb034f
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

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 0.9432

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/431946152/how-to-make-clothes-on-roblox-for-free-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/431946152/how-to-make-clothes-on-roblox-for-free-game-hack PDF link annotation
    • http://swibome.nl/images/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://swibome.nl/images/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://swibome.nl/images/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • http://swibome.nl/images/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • http://swibome.nl/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://swibome.nl/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://swibome.nl/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://swibome.nl/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://swibome.nl/images/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://swibome.nl/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://swibome.nl/images/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://swibome.nl/images/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • http://swibome.nl/images/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://swibome.nl/images/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://swibome.nl/images/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://swibome.nl/images/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • http://swibome.nl/images/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://swibome.nl/images/moon-active_GM406889139.pdfIn PDF document text
    • http://swibome.nl/images/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://swibome.nl/images/how-to-get-free-robux-on-android_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_off000048c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48C6 24928 bytes
SHA-256: b1dc523019bdccb6c1c0e35d4c4835ad689fcdaa06bac140a206c010cd1b373d
font_01_sfnt_off0000828e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828E 3500 bytes
SHA-256: e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634
font_02_sfnt_off00008e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2F 18976 bytes
SHA-256: b61b86c25d6115ff697aefd9ab641b9f071fd28e07f949dfa38bf6f9b5f40050

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