Malicious PDF — malware analysis report

Static analysis result for SHA-256 94408228e156cf15…

MALICIOUS

PDF

251.0 KB Created: 2021-07-05 21:13:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 99e0e538fdfad64c729316a573376639 SHA-1: 6c88aec7caf32e7328914630405e1b54444ea0e6 SHA-256: 94408228e156cf1536acd1893d3095fa9d5adb4dccc500c817978ece696d1514
258 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, masquerading as game hacks or free generators. It also displays a fake CAPTCHA or human verification prompt to trick users into interacting further. The primary lure is the URL http://netcdn.tw/app/1330123889/pubg-uc-20-game-hack, which is associated with brand impersonation and credential phishing tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 8

  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/1330123889/pubg-uc-20-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/1330123889/pubg-uc-20-game-hack In PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/wurst-minecraft_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/pokemon-go-free-gifts_GM1094591345.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/tiktok-free-code_GM835599320.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/www-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-roblox-accounts-with-robux-2021_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_024_off00037f2d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37F2D 26180 bytes
SHA-256: 3c34a3a75047d7841d984728006b0cec11be20c574eaf9a3341165f7ff8afd02
font_01_sfnt_off0003bc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BC99 18420 bytes
SHA-256: 865a906dde4eb364cc70dbebcf3b3063a042ab546f67162698d17b183479621a

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