Malicious PDF — malware analysis report

Static analysis result for SHA-256 4920ba21b0b752d2…

MALICIOUS

PDF

38.0 KB Created: 2021-07-03 15:13:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e5da10a64a48812a98c6231df8d3d7dc SHA-1: bf1a04fb1c88f46af9e723af1882f8cbe607a722 SHA-256: 4920ba21b0b752d25acd8657cad6e696180d40516d5259a57892e1d0313ccc52
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The presence of these lures and the ML classifier's high confidence score indicate a malicious intent to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/431946152/how-to-get-free-robux-for-kids-game-hack In PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/c-rex-hack-roblox_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-outrageous-builders-club-for-free_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-robux-hacker-com-2021_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-faces-for-free_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/robux-in_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/best-groups-to-join-for-free-robux-roblox_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-hack-week-twitter_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-cheat-nocliping_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/cheat-engine-roblox-tycoon-money_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C9C 22716 bytes
SHA-256: c824f7e01098bb76da0ec4976c747c8717ce49a5e16bd2b9922213512fde9f70
font_01_sfnt_off00006f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F28 19280 bytes
SHA-256: 88c4455e0f78c2960f3f491dd25ca64faee621a531e5cc2b52a2398397ae986a

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