Malicious PDF — malware analysis report

Static analysis result for SHA-256 c823d7fc52f94b20…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 17:33:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e8635d85cdea180088524f08d0dedbbc SHA-1: 0986e3a854f37322ba511fe5b69d571fb47437db SHA-256: c823d7fc52f94b20d3f0398bc75dd8e8027b509887ae8aeef4e418f72008606c
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and generators. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves directing users to these malicious sites, which likely host further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.tw/app/406889139/coin-master-hack-apk-2021-game-hack In PDF document text
    • http://oca.undil.tl/repository/free-robux-generator-virus_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-camps-uncopylocked_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/download-cheat-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-you-get-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/worst-client_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-sites_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-builders-club-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-robux-hack-generator_GM431946152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3087 23192 bytes
SHA-256: a38b4c2407232a27ea9904ea3907e74e9de1a55a94f364e9caeb90604571730e
font_01_sfnt_off000064d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D9 18580 bytes
SHA-256: 988cffcfddd5284471d100489432d065995cf4e12f938595ec8cdf0110751cf2

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