Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef530e12335a5cb…

MALICIOUS

PDF

44.7 KB Created: 2021-06-11 03:42:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 63ab633c874c068a14c2605031670aa2 SHA-1: bec3b6a4cd47c4133e6701d6ce3a5dbb323b805e SHA-256: 6ef530e12335a5cb3efe28d9e849b852aeb15d4d62ba6e735d520393f0abd1f6
182 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into clicking on links, which are part of a link farm. The primary link directs to a 'game hack' generator, likely a social engineering tactic to distribute further malware or engage in scams. The document's structure and content strongly suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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/pepsi-hacks-roblox-script-cbro-game-hack PDF link annotation
    • http://www.avorganic.org/uploaded_files/userfiles/files/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/tiktok-free-crunchyroll_GM835599320.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/roblox-superhero-simulator-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://www.avorganic.org/uploaded_files/userfiles/files/is-minecraft-java-edition-free_GM479516143.pdfIn 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_off00005038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5038 25188 bytes
SHA-256: e1a66147d8977aefe600971c999c08cbe6f07f0ae8c2beba05809824660b3f5c
font_01_sfnt_off00008abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABC 18736 bytes
SHA-256: d8c39ad983873d730172c2b553c533933542efc0164a118ef0c35c5470a975f8

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