Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d3511aaeb2cab2…

MALICIOUS

PDF

48.2 KB Created: 2021-06-03 05:55:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 002309674ca7ca38aa01fd9a6f78e38d SHA-1: 09c1fb03675063d070182a570a6edea3b9b47d3d SHA-256: 83d3511aaeb2cab2a28873a8fcc074c9dc762b5caf81c61e55ab437e455c049a
240 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics, presenting a fake CAPTCHA and a download button lure to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, likely serving as a gateway to further malicious content or exploits. The document's content and heuristics strongly suggest an attempt to exploit user interest in game-related cheats or hacks to deliver malware or facilitate credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://netcdn.online/app/406889139/how-to-get-free-spins-in-coin-master-2021-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/robux-place-rewards_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-2021-hack_GM406889139.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_off000054bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54BB 24872 bytes
SHA-256: 33fab453abe884d04925b4c2c78f6066c3b026f7848a1add55d0ea8f1c5a64f8
font_01_sfnt_off00008cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB7 3560 bytes
SHA-256: 9d03f7c6c62ba3e7fdc0441e9d982a863b2b60b781165d6920512f68ecc4a440
font_02_sfnt_off0000993e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x993E 18452 bytes
SHA-256: 614b442f464a30c8e1247073dd83761b8901fda729b002daf0f1775ab60cf60b

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