Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f8c689f285538c…

MALICIOUS

PDF

46.7 KB Created: 2021-06-10 23:25:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 43b2c4985ef31d954e490862e433677e SHA-1: 085cfa8ad1066040d1f98f13b948951ccb9ccb7d SHA-256: 98f8c689f285538c674a8cccdf3ebd8a1b2bc2886ec9d60f3be8a6ee3ee25e7a
162 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure and a password-protected-archive 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 0.9748

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/getbucks-me-robux-free-game-hack PDF link annotation
    • https://repository.stikesindramayu.ac.id/repository/static-moonactive-net_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/wurst-112_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-tix-on-roblox-no-hack_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/roblox-jailbreak-free-vip-server_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/roblox-jailbreak-hacks-2021-may_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/script-executor-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_004_off00004fe8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE8 25640 bytes
SHA-256: da5955e81ff467f19938559b3b347ee549dbc13e4c7d8f9f01ab22be4d6e172c
font_01_sfnt_off00008991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8991 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9340 18484 bytes
SHA-256: f971c24057a792df50a2f4630ddb9669a64d91624e5f792ce9e4cfce76344a17

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