Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbecef5df36887f9…

MALICIOUS

PDF

225.9 KB Created: 2021-07-05 07:18:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 527e13d2beec8cd809ec12b2c2334196 SHA-1: 54136b6b0e11567554aab95ad78c4fee4d3fb975 SHA-256: cbecef5df36887f9fd3055dc122f763adebc7509d9d15b30b44ebb667c91c769
250 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple heuristics indicating social engineering lures, including a fake CAPTCHA, a browser extension installation lure, and a payment redirection lure. The primary lure appears to be a 'free generator / game hack' which redirects to a known malicious URL. This suggests the document is designed to trick users into visiting a malicious site, likely to download further malware or engage in credential theft.

Machine Learning

  • Nyx PDF Classifier clean score 0.0117

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-game-game-hack In PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/pubg-uc-download_GM1330123889.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-stuff-dungeon-quest-roblox_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/roblox-vehicle-simulator-money-hack-download_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-get-free-bc-on-roblox_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-link_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-get-free-robux-no-hack-or-cheat_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/roblox-free-cape-catalog_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-get-robux-free-without-human-verification_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/roblox-play-as-guest-for-free_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-hack-username-and-password-on-roblox_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/pokemon-go-free-promo-codes-march-2021_GM1094591345.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-to-get-free-robux-on-a-ipad_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_off00031d2a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31D2A 25576 bytes
SHA-256: 3a968acfa99fa87f9335b5d11a74a0f5ba51fa37b1b9aabc52608b80775081b0
font_01_sfnt_off00035930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35930 18360 bytes
SHA-256: 92ac6ad3a0b958f298a7cb140fdcde4f079912748741e3bde8383a31f8ed3a1e

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