Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab20ed5f88393abc…

MALICIOUS

PDF

41.8 KB Created: 2021-05-11 07:31:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f1c9ef515ada74ecd366650152881bc6 SHA-1: 1bc6a4de3fe4c8ea9020b7b278122f4c374b5553 SHA-256: ab20ed5f88393abc91304317fda06c37df7a98c9f106332460134cd109ccf23e
200 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a 'free generator / game hack' and presents a fake CAPTCHA to trick users into clicking it. The ML classifier strongly flagged this PDF as malicious, and embedded URLs point to known malicious infrastructure. The document's content and heuristics suggest a phishing or scam attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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
  • 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/show-me-how-to-get-free-robux-game-hack In PDF document text
    • http://apx-centre.ru/images/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-girl_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-to-village-3-in-coin-master_GM406889139.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_003_off000046c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46C2 25116 bytes
SHA-256: 3bb2839acf08721ca1b04749a031ba438fda0329eadb38307e36796dbf56062f
font_01_sfnt_off00007fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD9 18644 bytes
SHA-256: e51f5be8af2709164d8b68ea121f2f3a624582c0bbe9bba0986852bbf2bf647d

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