Malicious PDF — malware analysis report

Static analysis result for SHA-256 2339c7fa9303b762…

MALICIOUS

PDF

43.0 KB Created: 2021-05-13 13:32:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 23e6ce31ab04244809422d19d85cee68 SHA-1: 35dbdb5c6b584ff8ebc030d0475122614d9da48b SHA-256: 2339c7fa9303b7624fe5b45a54fb3f7c398f58b866a54ed94cd2fcba139f3409
200 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a "working Coin Master Hack 2021" and presents a fake CAPTCHA to trick users into clicking it. This behavior is consistent with phishing or scam lures designed to lead users to potentially malicious websites or download further payloads. No scripts were extracted, but the embedded URL and the fake CAPTCHA heuristic strongly suggest a social engineering attack.

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/406889139/working-coin-master-hack-2021-game-hack In PDF document text
    • http://www.alsultantrading.ae/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/robux-download_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://www.alsultantrading.ae/userfiles/files/roblox-free-hair-girl_GM431946152.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
font_00_sfnt_off00004bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BED 24792 bytes
SHA-256: a4dab3510715ec49cc297d6c3d41250aced575e5b0197bbd76ca8780297a4b07
font_01_sfnt_off000084b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B3 18604 bytes
SHA-256: 744d1e6e570083d44e7505cde547d0f6819516289f88227fe4d6f00d173cb084

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