Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd628d196889c7ac…

MALICIOUS

PDF

46.4 KB Created: 2021-06-03 06:11:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3a3fb776b13e6347e33407fdf340d554 SHA-1: 4266729100e0cf039646fe4016d9f83fd9afbd61 SHA-256: bd628d196889c7ac2ad86836110e493f39e6c02bfa919f3f2c22ba1539c0db87
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document employs a social engineering tactic, specifically a 'ClickFix' lure, by instructing the user to press Win+R or paste a command into a terminal, likely to bypass macro restrictions and trick them into executing malicious commands. The document contains a high-risk external URI pointing to a 'free generator / game hack' lure, which is a common pretext for malware distribution. No scripts were extracted, but the embedded URI is the primary indicator of malicious intent, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/479516143/free-private-minecraft-server-game-hack PDF link annotation
    • https://www.knjigebuducnosti.com/files/free-robux-net_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/robux-app_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/install-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-strategy_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/apps-to-get-free-robux_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_off0000516d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516D 25324 bytes
SHA-256: 25507dee22f7e44abd6e2d71c8f9c327231f61b326d959ef037c7ae8d0953219
font_01_sfnt_off00008a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2C 2856 bytes
SHA-256: 8c5d9bcb386d88c7f99323d8d482e46ea21dea038a5b842744dd5d39b26b2c44
font_02_sfnt_off00009402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9402 17836 bytes
SHA-256: 7ff77ee3a78605da9ef85fec4605ea670974ab48e4ca839a7389016eb6bc2a09

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