Malicious PDF — malware analysis report

Static analysis result for SHA-256 c769010e1debeb0d…

MALICIOUS

PDF

48.8 KB Created: 2021-06-03 08:39:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 654ac1f111c55ab4e89beb0b30214cef SHA-1: c40c69bd50d2144112787bbe352476b4a5ae2309 SHA-256: c769010e1debeb0dea6f45b20449df317d31e274754716b75ce0fde769b561b2
300 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and brand impersonation lure to trick users into clicking malicious links. The primary link redirects to a site offering game hacks, which is a common tactic for credential phishing or malware distribution. The document also contains a large number of links to other PDF files hosted on a similar domain, suggesting a link farm for SEO manipulation or further distribution. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 7

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.online/app/431946152/how-to-get-free-robux-easy-no-download-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.online/app/431946152/how-to-get-free-robux-easy-no-download-game-hack In PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/roblox-hack-for-robux-kredi-kart_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/tiktok-accounts-for-free_GM835599320.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/coin-master_GM406889139.pdfIn PDF document text
    • http://www.en.guofuhee.com/Public/upload/editorfiles/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D3 25664 bytes
SHA-256: 5112a431528c5039ebfa1590fbbc653caffd35437d347c82e64bbdb264ee5f4e
font_01_sfnt_off00008f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8F 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off0000993f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x993F 19108 bytes
SHA-256: 7bc61c49a0b734df4d56b9cb8c894117daf111bfa68c773dcc76edca8f070452

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