Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e57831482966c0…

MALICIOUS

PDF

39.0 KB Created: 2021-05-21 10:21:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8dde1f8ea0fbeb75f071dced998a32c4 SHA-1: ceff6ec73af849c74ece2e4cfffa4830f50e8c8f SHA-256: 33e57831482966c02c7aa7990efcd439faf9903439c4b6416c743fb8132a306b
240 Risk Score

Malware Insights

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

The PDF document uses a fake CAPTCHA and brand impersonation lure to trick users into clicking a link. This link redirects to a malicious domain, likely to download a second-stage payload or lead to further phishing attempts. The document's content and heuristics strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/microsoft-rewards-free-robux-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
  • 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/microsoft-rewards-free-robux-game-hack In PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://pustaka.industri.ft.unand.ac.id/repository/free-online-games-like-minecraft_GM479516143.pdfIn 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_002_off000034c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34C6 27640 bytes
SHA-256: 7d48bcaab98b3c1cb8dc777770f9700c77b7d99c12c3c6faaccccd99e13460a0
font_01_sfnt_off000074dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74DD 19000 bytes
SHA-256: bff5f29590f6f5248b316a672d4808b6e9c266d69e419f7f33dc0e1be49a23cf

Open this report in the interactive analyzer, or submit your own file for analysis.