Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e09c9d37e7aff69…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 10:43:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e6e9cb5afdc33fe6cf6aa81bc284061c SHA-1: 52402f215c5c7032af0b4e6da5e76d167e04f52a SHA-256: 3e09c9d37e7aff69cbebaddb9b937962e0582406c7827c8a0e8747e4fe729c7b
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA and a download lure, designed to trick users into clicking links. These links lead to a malicious redirector infrastructure, specifically promoting a 'free generator / game hack' which is a common lure for scams. The document body also contains multiple embedded URLs pointing to similar scam-related PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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
  • 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/free-coins-coin-master-no-human-verification-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/tiktok-free-99_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-and-spin_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-money-roblox-rocitizens_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-coins-link-blogspot_GM406889139.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_004_off00004f35.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F35 25968 bytes
SHA-256: 02cf182791219ac58cd3944cdec3965ebecee5a2c6b50b0c12003ca36cdbb40f
font_01_sfnt_off00008ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE4 18244 bytes
SHA-256: 01d63b1d73aa8bf8d24c0c61ee418a5c78711e36496b8284aaee89190376465e

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