Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc4514e1e57c80c…

MALICIOUS

PDF

51.2 KB Created: 2021-06-13 23:35:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dc06432f2d686cd482a05f7edf1c5ad7 SHA-1: 7214347378f7fa3e43cd1120eec429e71c1d23c4 SHA-256: fdc4514e1e57c80c0a50f60502fbd6702a9f492da0c163e7fcc141b3ef191e4f
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors, disguised as game hacks and free generators. It also presents a fake CAPTCHA or human verification prompt to trick the user into interacting further. The primary malicious URL identified is http://netcdn.co/app/431946152/robux-gratis-sin-hacks-2021-game-hack, which is likely used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9246

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 http://netcdn.co/app/431946152/robux-gratis-sin-hacks-2021-game-hack In PDF document text
    • https://lesegais.ru/images/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/get-robux-today_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • https://lesegais.ru/images/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/xray-hack_GM479516143.pdfIn PDF document text
    • https://lesegais.ru/images/roblox-free-codes-on-toys_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/free-tix-roblox-pbb_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/brown-hair-roblox-free_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_003_off00004c9b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C9B 26352 bytes
SHA-256: e2bdf64e085560bc1876cefba57137ae28e0613817b71fc2fd81549e55286909
font_01_sfnt_off0000890b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x890B 8376 bytes
SHA-256: 092b7a11ef2af93d0b61b37032e6f669359ea7bc5bcb682d43a712f599a5ca39
font_02_sfnt_off0000a3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3DA 18872 bytes
SHA-256: e42e9a4f1442a5d407d943ceeff6236adcd3b562090591bbc5e60c37c0b5c9ad

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