Malicious PDF — malware analysis report

Static analysis result for SHA-256 23326147fb9b514a…

MALICIOUS

PDF

41.2 KB Created: 2021-05-15 10:11:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2e8ae104a3ad7dcda1caa3ae0ffd2730 SHA-1: b27f420b52453384b42f299fdea15a4991f8e463 SHA-256: 23326147fb9b514ac1c2fd7affaa798c14ca6a07bab7bfd0849f0fdfdb7ee9b4
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, which are identified as redirectors to potentially harmful content. The document body and embedded URLs strongly suggest a scam related to in-game currency generators. No scripts were extracted, but the presence of multiple malicious redirector links indicates a high likelihood of further malicious activity.

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/coin-master-free-spin-ml-game-hack In PDF document text
    • https://www.u-pin-it.com/images/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • https://www.u-pin-it.com/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.u-pin-it.com/images/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://www.u-pin-it.com/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.u-pin-it.com/images/master-coin-free-link_GM406889139.pdfIn PDF document text
    • https://www.u-pin-it.com/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://www.u-pin-it.com/images/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • https://www.u-pin-it.com/images/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.u-pin-it.com/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.u-pin-it.com/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://www.u-pin-it.com/images/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.u-pin-it.com/images/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://www.u-pin-it.com/images/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://www.u-pin-it.com/images/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.u-pin-it.com/images/free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • https://www.u-pin-it.com/images/minecraft-wurst-client_GM479516143.pdfIn PDF document text
    • https://www.u-pin-it.com/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.u-pin-it.com/images/free-100-robux_GM431946152.pdfIn PDF document text
    • https://www.u-pin-it.com/images/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • https://www.u-pin-it.com/images/roblox-free-robux_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
stream_003_off000047a9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47A9 24312 bytes
SHA-256: 3715b4ebc90522263fbb8e3281dbafa5df9797c8197a4f0249e51ebc4842d80c
font_01_sfnt_off00007f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F74 17960 bytes
SHA-256: 444b71fec9169bc90a734dd5dd223b39b45661ce510f738c863c1de9395466a1

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