Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbb4690c858c0f4…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 18:36:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7f4bcfd78e1f55e89455ae7c242d374c SHA-1: 0f947a7a8d9ddadc885edc6283ee0c3bddccc361 SHA-256: 9cbb4690c858c0f4c481506931fcdedd083708f897ed0e577500f68f578a4b19
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, disguised as game hacks and generators. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or exploits. The document's structure and embedded URLs strongly suggest a phishing or scam attempt aimed at users seeking in-game currency or cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-cracked-apk-free-download-game-hack In PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/infinite-robux_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/get-robux-now_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/www-rubux_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-minecraft-skins_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_004_off00004c14.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C14 26304 bytes
SHA-256: eccb7c6e55eb585e379c0803138101b1df5459fee29f32c0ee1c21a527b44d88
font_01_sfnt_off000087af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AF 18636 bytes
SHA-256: ce5b0e3eeaf971f653fd3a856714b5eb72d36c019aebfe22933050d37cc78532

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