Malicious PDF — malware analysis report

Static analysis result for SHA-256 99140f5896e074eb…

MALICIOUS

PDF

251.2 KB Created: 2021-07-05 02:22:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 054f06761856fbdc525ad9dd3554fa24 SHA-1: cd1268c6c9e1ad32d94f87a0cb21cb84ed90f567 SHA-256: 99140f5896e074eb860d30cf186f430dc3e4fae4c70623c3e5fcc2284a23b2e8
258 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating a lure for game hacks and credential phishing, specifically impersonating Apple. It directs users to a malicious redirector URL, http://netcdn.tw/app/1330123889/pubg-uc-with-jazz-cash-game-hack, which is associated with known malicious infrastructure. The presence of a fake CAPTCHA and MFA lure further supports the intent to harvest user credentials or abuse authentication mechanisms.

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-with-jazz-cash-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-with-jazz-cash-game-hack In PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/how-to-get-free-robux-on-oprewards_GM431946152.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/roblox-cursed-islands-hack_GM431946152.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/spam-click-free-robux-script-v3rmillion_GM431946152.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/free-robux-come_GM431946152.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/robuxmaniac-free-robux_GM431946152.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/free-roblox-promo-codes-june-2021_GM431946152.pdfIn PDF document text
    • https://stain-madina.ac.id/assets/ckfinder/userfiles/files/free-minecraft-skin-packs_GM479516143.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_off00037e88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37E88 25928 bytes
SHA-256: ad8fd3ff2d6ee853029ebe83c8acba7748aeb889ca4fd9c26dfbc5b925331850
font_01_sfnt_off0003bba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BBA7 18960 bytes
SHA-256: 0841e1cf9c9dd39c9a0d9c74b2d5cfdb090c2313c3f3533999ad81c3544ae492

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