Malicious PDF — malware analysis report

Static analysis result for SHA-256 10449578335af974…

MALICIOUS

PDF

250.8 KB Created: 2021-07-05 19:25:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b56119bcd0a6f8436ff40b8a271922e4 SHA-1: 1f180196515c5f3bbf50ab65f2b05bec04432b70 SHA-256: 10449578335af974c8ca004fe782c4e766b626cd2daee80efdd1b12e272402bf
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal Application Access Token T1204.002 Malicious Link

The document presents a fake CAPTCHA and impersonates Facebook to trick users into clicking a malicious link. The link leads to a page that likely attempts to harvest credentials or session tokens, potentially for account takeover. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 7

  • 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/how-to-pubg-uc-transfer-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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/how-to-pubg-uc-transfer-game-hack PDF link annotation
    • http://library.yamasi.ac.id/repository/youtubbecom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-06-accounts-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/first-time-builders-club-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-roblox-players-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/i-want-to-break-free-roblox-versin_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-20-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-catalog-roblox-wiki_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-websites-scam-link_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-dominus-roblox-event_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/pokemon-go-free-app_GM1094591345.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-roblox-perfil_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_off00037e7e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37E7E 25928 bytes
SHA-256: 120ce76c2d7a3d0e390f21a81135e2690b377655001eec22409d77987d3cc613
font_01_sfnt_off0003bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BB86 18432 bytes
SHA-256: 1751816c9357e961b7cfbd5ef82c7abf73a9ac66ea0022f1a411157e715cee3d

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