Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba477b184881f89…

MALICIOUS

PDF

45.3 KB Created: 2021-05-10 20:47:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c696e1cb8ca35ff2bdcc91f160b5b10c SHA-1: 9d67a8216890fe3fd1b98744a8f277de7a8a8e99 SHA-256: cba477b184881f898c87d93b55f9b2c0f92379dd7e62b2e30afd24b8ff4acfbc
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors and a large number of SEO-optimized PDF links, indicating a campaign to drive traffic to potentially malicious sites. The document body and heuristics suggest a lure related to game hacks and free generators, with instructions for password-protected archives, a common tactic to bypass security filters. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.xyz/app/406889139/coin-master-cards-hack-2021-game-hack In PDF document text
    • http://library.unissula.ac.id/fk/repository/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-coin-spin-daily-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-no-human-verification-or-survey-2021_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_003_off00004cec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CEC 31492 bytes
SHA-256: c8ef2b991977e375d6f5f64a09230a6f4d2b0bcadd91cc4fff8be13f44004899
font_01_sfnt_off00008e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E84 18292 bytes
SHA-256: 56ed892f9c960ec28c91726eeb440a92294fcef820bc23b96874e10d7a9d3574

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