Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ce0f9f9ed4b620…

MALICIOUS

PDF

47.3 KB Created: 2021-06-10 22:57:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4983ba0f4a1dda390ef4a50e77a6fb9b SHA-1: bc16aebd4ed153540b0a4d1ddc9495e6279a0974 SHA-256: a4ce0f9f9ed4b6202b269bd19565de812ea79f0a823fbc11a7b7702873e8a8bb
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document contains multiple links to known malicious redirectors, including one that impersonates Microsoft to phish for credentials. The primary lure appears to be a 'game hack' generator, which redirects to the malicious infrastructure. The document's structure and embedded links suggest it is designed to trick users into visiting malicious sites, likely for credential harvesting or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • 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.tw/app/431946152/are-there-any-roblox-hacks-that-actually-work-game-hack.
  • 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.tw/app/431946152/are-there-any-roblox-hacks-that-actually-work-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-java-hacks_GM479516143.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
font_00_sfnt_off00005304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5304 30172 bytes
SHA-256: 288bdd2758c1e6ec379e335c24cdd010d92a026d6258e6d3214ad056e61dd59d
font_01_sfnt_off00009463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9463 18968 bytes
SHA-256: dfde105ab510194c7d84b328661abdef4aa93b5af6d4016dd0759b29126dc7cb

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