Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1a497745996bba…

MALICIOUS

PDF

250.8 KB Created: 2021-07-08 18:10:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1e259b0edf399434a4a89b433e671ce9 SHA-1: ec10c1d81e983a44c59d36d0e6c46ed6457c8d8a SHA-256: 0b1a497745996bba9ed91b7a140cd5201652b01c59825d5dcbffa749d0d55db9
180 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. It uses brand-impersonation credential phishing, a fake-CAPTCHA lure, an MFA/2FA-themed lure and an urgency-based lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 8

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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/does-pubg-uc-generator-work-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/does-pubg-uc-generator-work-game-hack PDF link annotation
    • https://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • http://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/rbx-hut-promo-codes_GM431946152.pdfIn PDF document text
    • http://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/admin-hacks-roblox-ban-pll_GM431946152.pdfIn PDF document text
    • https://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • https://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/instantrobux_GM431946152.pdfIn PDF document text
    • https://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/pokemon-go-vs-free-fire_GM1094591345.pdfIn PDF document text
    • http://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • http://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/how-to-hack-202120210-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/official-robux-hack_GM431946152.pdfIn PDF document text
    • https://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://elearningman2.man2palembang.sch.id/__statics/gudangsoal/files/roblox-hack-robux-2021-no-human-verification_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_off00037d19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37D19 25928 bytes
SHA-256: 41ae9f600344fbf501598a211088d195f63ce445193a2b8f64448ed3b5ed1b3a
font_01_sfnt_off0003ba2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BA2E 18908 bytes
SHA-256: a107d3594803b11374be60c29e912d91ef413e7617813dcf1b62d58b2116937c

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