Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e4109e787b3abb…

MALICIOUS

PDF

48.4 KB Created: 2021-05-15 22:34:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cbca47abe71b0a1f64df0eca673890a1 SHA-1: f0a915c9e4ca7be9751b43be37891b29fb32bef9 SHA-256: 13e4109e787b3abbc7eb9e84cc7d3b5ef976e8d966c4157f2088727026b46a16
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1555.003 Credentials from Password Stores: Credentials from Web Browsers

The PDF document employs a lure of 'Free Robux Generator' and a fake CAPTCHA to deceive users into clicking malicious links. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-generator-2021-no-survey-game-hack, which is associated with brand impersonation for credential phishing. The document also contains numerous other links pointing to potentially malicious content hosted on perpus.ar-rum.ac.id.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.xyz/app/431946152/free-robux-generator-2021-no-survey-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/free-robux-generator-2021-no-survey-game-hack PDF link annotation
    • http://perpus.ar-rum.ac.id//repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/roblox-source_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/100-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
font_00_sfnt_off00004b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B1D 34548 bytes
SHA-256: 5bdcde4c6d5ef99576f2832803f5f3fd88b82967098a13ac9ac1bfca099df3da
font_01_sfnt_off000098c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98C6 19044 bytes
SHA-256: 6a3befe032ce85dfab02daa9542f37d979e32cd852f1a969db8cf02301732b57

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