Malicious PDF — malware analysis report

Static analysis result for SHA-256 76546e78004b3a5f…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 07:31:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d6433b2972777bad10cf6e290ec7ea3e SHA-1: 0a375068dd1c8b96d68827b33b956d5a9ea32f6a SHA-256: 76546e78004b3a5fd3bdff7bb210eb5a223faa6c5224ba59409ef042f8d1b273
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game hacks. The embedded URLs, such as 'https://netcdn.online/app/431946152/lazy-blocks-com-free-robux-game-hack', are designed to lead users to potentially harmful content. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to deliver further payloads or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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/lazy-blocks-com-free-robux-game-hack In PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/robux-withdraw_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/wurst-client_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/minecraft-wurst-hacked-client_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
stream_004_off0000517c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517C 24576 bytes
SHA-256: c4b84b1274c38161fb1f1062b6202ff57bb03eaa27aa5dad56988ff3e1216e44
font_01_sfnt_off00008a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2A 19008 bytes
SHA-256: 34c8d34d38b90765c6e33941713304debcf78082891e10a16d595afa5c3321d4

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