Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5017b1147f0f0d5…

MALICIOUS

PDF

51.0 KB Created: 2021-06-08 15:19:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c75cf88e2ab8b8857bb50107a8325f9c SHA-1: 41eae83bc30efee3ec5a310b2d7b89c6401c5398 SHA-256: c5017b1147f0f0d59450c5836d553d6917752a61ac2f83134f4b91b7ad68e71e
142 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. 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 0.9724

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/robux-free-gift-game-hack PDF link annotation
    • http://103.40.122.33/akasia/repository/how-to-free-robux_GM431946152.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/money-cheats-for-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/pubg-mobile-uc-2021_GM1330123889.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005294.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5294 29280 bytes
SHA-256: 63fbe5e0e430a7e98b33280fdaa63ca75e9fec2859a7756dedfa53c3b773f4a8
font_01_sfnt_off0000965d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x965D 4392 bytes
SHA-256: cc5719707df4c6b0d67c8375cf28d3c9c39cf9bf5118c81e553daaf30d5eb3a5
font_02_sfnt_off0000a50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA50A 18236 bytes
SHA-256: 90a9252c22cf2e05361349a0456dabbcff38199ab20ef2e8f5bb3aad36312c49

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