Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a9ab2f26efe01f…

MALICIOUS

PDF

45.0 KB Created: 2021-06-11 08:19:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: de7611c86560eb78a3ee4ceec4a55f53 SHA-1: aa0829f1628057aaea1c1f353db375f3500aa3ac SHA-256: 48a9ab2f26efe01f8334d5f3c611d8c4657f93d2e81b95f34cb473988e000722
162 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating a lure for game hacks and credential phishing, specifically impersonating Microsoft to offer 'free Robux'. The document body, though heavily obfuscated, contains references to the malicious URL and game-related terms. The primary malicious activity observed is the redirection to a URL designed to trick users into believing they are obtaining game cheats, likely leading to further malicious content or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/roblox-cheat-codes-for-robux-and-tix-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.tw/app/431946152/roblox-cheat-codes-for-robux-and-tix-game-hack PDF link annotation
    • http://perpus.polbitrada.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/roblox-2021-feburary-fly-hack_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/800-robux-free-pub_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/gladiator-simulator-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/robux_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bandicam.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D2 24860 bytes
SHA-256: b6b7bb538da45584e1cac0b160f14d4d68bb3765c15f125ffd08ce22a335f38c
font_01_sfnt_off00008b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B73 18880 bytes
SHA-256: 492312287bd17f432ee17877cd9b62a8c9ac936fd0a11d1d630b96342f5215b0

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