Malicious PDF — malware analysis report

Static analysis result for SHA-256 55738a0170b0739c…

MALICIOUS

PDF

48.1 KB Created: 2021-06-07 20:41:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 667bda978ad94c9ea903b489df6bb0fa SHA-1: d46dc7622ccc03ef6d1ee1ac9915e3d34abe9396 SHA-256: 55738a0170b0739c3e4f6053e0d87ee095d17f74c4f0d0924c7f69c68aa5d065
260 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, promising game hacks and currency. The document contains numerous links to redirector domains and SEO-optimized PDF files, suggesting a phishing or scam campaign. While no scripts were directly extracted, the nature of the links and the lure indicate a high likelihood of further malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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
  • 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.tw/app/431946152/hackers-on-roblox-that-will-give-me-free-robux-game-hack In PDF document text
    • http://uristdona.ru/images/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/exe-roblox-hack_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://uristdona.ru/images/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://uristdona.ru/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://uristdona.ru/images/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005143.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5143 25488 bytes
SHA-256: 994dbf17e59341ce1a6db457ec963d7ee7d83831139d473cc9ecbaf718bc7420
font_01_sfnt_off00008c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C71 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9623 19384 bytes
SHA-256: e003e00906e5c9569ab12eb15bf656f11a6901017fb5b9aa98d6aa7bc79a9ee6

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