Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2326f693522fa06…

MALICIOUS

PDF

250.2 KB Created: 2021-07-06 07:53:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b4d3e78e566b86f407f2c122dde0ab35 SHA-1: fd560ad9cbc0c969fd47eb7111a71550c4557525 SHA-256: c2326f693522fa0650cfc811693c34a9b7f133b73b68e3259624e96853480dac
258 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1555.003 Credentials from Web Prompts

This PDF document employs a game hack lure to trick users into clicking a malicious link, which then presents a fake CAPTCHA and MFA prompt. The primary link, http://netcdn.tw/app/1330123889/pubg-uc-xyz-game-hack, is associated with known malicious redirector infrastructure and impersonates brands like Apple. The document's structure and embedded links strongly suggest an attempt at credential harvesting or session token theft.

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-xyz-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-xyz-game-hack In PDF document text
    • http://library.umla.ac.id/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/robux-now_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/alone-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-free-shirts-free-shipping_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/what-to-do-if-your-roblox-account-has-been-hacked_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_off00037b7f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37B7F 25928 bytes
SHA-256: 635673e0f4f9a41315dac198c300db6947d9fcca421fb951165c60cf3c42f2d7
font_01_sfnt_off0003b88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B88D 18616 bytes
SHA-256: d9d49b223c36aafa7a6fbde0ab429d3cc8a45538b78f26b89455f989f27c68ca

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