Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3cd8837cd75675…

MALICIOUS

PDF

44.4 KB Created: 2021-06-13 22:25:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 78d953d9c24569f94a4ac96f935afa7b SHA-1: 636318c08ce0fa751b3b5fea1a579ea3a9f8b79b SHA-256: 0a3cd8837cd75675ed99453170d680e0c27a3863ac96101beb2833d85f92737f
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for 'free Robux' and impersonates the Apple brand, directing users to a suspicious URL. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a game hack redirector and a brand-impersonation credential phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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: http://netcdn.co/app/431946152/free-robux-giver-no-human-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 http://netcdn.co/app/431946152/free-robux-giver-no-human-verification-game-hack PDF link annotation
    • http://library.ulb.ac.id//repository/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/pubg-uc-17_GM1330123889.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-become-a-roblox-admin-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/boku-no-roblox-remastered-hacks_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/legit-free-spins-coin-master_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
stream_003_off000048ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48EF 27852 bytes
SHA-256: fb964fa2fdb8547e44eff8e7885ee395b4287af2a786449ef38e30b3012214db
font_01_sfnt_off00008965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8965 18972 bytes
SHA-256: cf0086562f8951995029bb383d7f094fdce7f3738bdfcef9a5857aa945e8432d

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