Malicious PDF — malware analysis report

Static analysis result for SHA-256 04315e7fa7f4bf7b…

MALICIOUS

PDF

44.5 KB Created: 2021-06-04 04:57:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a56efb15866a0ac6d453d708c03e8808 SHA-1: 5fca1494267201f857b41e9b42d427834f8d99da SHA-256: 04315e7fa7f4bf7b630aeab69b9862f5d14892b79ac845f02c8999ca30b9b240
260 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors and impersonates Netflix to lure users into clicking on a 'free Robux generator' link. This is a common tactic for credential phishing or distributing further malware. The document also displays a fake CAPTCHA, likely to trick users into executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 7

  • 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
  • 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: https://netcdn.online/app/431946152/robux-app-game-hack.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://netcdn.online/app/431946152/robux-app-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/robux-premium_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/grabpoints-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/apps-to-get-free-robux_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_004_off00005168.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5168 26456 bytes
SHA-256: b3a7e3f6e93b7d08399808cbd3c2cbfe888f4dbfbd123bce9a414fee508766ef
font_01_sfnt_off00008c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C32 18024 bytes
SHA-256: 219c55bb431f43351bcf1592a83073a1c751ddd41efaa2bf419dfd5689889aab

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