Malicious PDF — malware analysis report

Static analysis result for SHA-256 1885f9a6cbe80af9…

MALICIOUS

PDF

45.8 KB Created: 2021-05-13 18:02:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2a37fc9ea5095598ab5fb6fdc8baf6fb SHA-1: 30a62f845ce318054616e8574d45a4ed42a206ed SHA-256: 1885f9a6cbe80af93dac51954c1d6f859215df0c8941c329bf0065f14e4a742e
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, disguised as a game hack generator. It contains numerous links to redirectors and SEO-optimized PDF files, suggesting a campaign to drive traffic to potentially harmful sites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/479516143/minecraft-noob-vs-pro-vs-hacker-game-hack In PDF document text
    • http://stroybelan.ru/images/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-card-collection-hack-apk_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://stroybelan.ru/images/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://stroybelan.ru/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://stroybelan.ru/images/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://stroybelan.ru/images/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://education.minecraftIn PDF document text
    • https://playhack.in/minecraftIn 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_003_off00004c51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C51 25440 bytes
SHA-256: c654c7cf0a7a5d0bb3eb82f4dd1a3d12443883320e18f2b522de473894c5fe41
font_01_sfnt_off00008678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8678 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00009088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9088 18328 bytes
SHA-256: a3a1f77715833b119a7491346a779344ae6dab601cd7000bc388e6bf0c64b7ed

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