Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4fea6885fc0386…

MALICIOUS

PDF

47.8 KB Created: 2021-06-03 06:31:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1affed3fdcdcf1048e6645f3b9788036 SHA-1: 78619935c65c8772188135f4ffa275e74adf915f SHA-256: fd4fea6885fc038655c1fe4baa502d6fd1ff2b18236a3bd2ebd4e4197d189eae
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-robux-cards-game-hack PDF link annotation
    • http://knjiznica-oroslavje.hr/files/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/install-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-free-robux-hack_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_off000050ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50AC 25544 bytes
SHA-256: aad9efd1c41cadd2d7caafa7c6f92fbcc6ba2d50a4a29fe3a710839199dddcac
font_01_sfnt_off00008c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C10 3556 bytes
SHA-256: e3d8b2ca40376717033c3a16dd0f07518620375180696be475b2210f483846c3
font_02_sfnt_off000097c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97C5 18416 bytes
SHA-256: 79c56a0f23d4fc34690a575a065be14b64911c3c5a3331038291264b4b7107af

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