Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a66b6e465e5b26…

MALICIOUS

PDF

226.5 KB Created: 2021-07-03 23:01:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a862f302e22c51aa8d71305da2da5e59 SHA-1: c3880068dc83380885b5b7cf8e59d3d3352844d3 SHA-256: 21a66b6e465e5b26fa9a02336810b758448fda0be26372901f18fa2263a7a122
250 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 a fake CAPTCHA and game hack generator. The primary link, http://netcdn.tw/app/1094591345/pokemon-go-free-to-play-guide-game-hack, is designed to trick users into downloading potentially malicious content or visiting further compromised sites. The document's structure and embedded links strongly suggest a social engineering attack aimed at initial compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 7

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://netcdn.tw/app/1094591345/pokemon-go-free-to-play-guide-game-hack In PDF document text
    • https://mbbs.hr/files/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-22k_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-on-roblox-2021-no-hacks_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/speed-hack-assasin-roblox_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/get-free-robux-at_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/flamingo-free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/robux-hack-giveaway_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-mouse-fre_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/earn-free-robux-by-doing-tasks_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-can-i-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-shirt-adidas-free_GM431946152.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
stream_023_off00031d6a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31D6A 25576 bytes
SHA-256: 1057ee1bbcce9e369c30a187b1335cdbc4e7a046703cf9ac1e211036e300f8db
font_01_sfnt_off00035976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35976 19044 bytes
SHA-256: 7b607e7b29956e9995b4b9950e4bd8b892d5b27240d0dc25b7667d82a7ef53c4

Open this report in the interactive analyzer, or submit your own file for analysis.