Malicious PDF — malware analysis report

Static analysis result for SHA-256 16517e7ca23a42a6…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 02:14:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7208671ecabc348c1480c8d5ec899395 SHA-1: 2fe36fb27de97a884eeab4fd86e5df25506537c0 SHA-256: 16517e7ca23a42a6bf76c5b8d818060cdcc02fda5046e5ab4a4a1afca40d876b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary redirector URL is http://netcdn.tw/app/431946152/free-hair-roblox-boy-game-hack, which leads to further malicious PDFs hosted on librarysenior.com. The document body and heuristics indicate a social engineering tactic to trick users into visiting these sites, likely for further malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-hair-roblox-boy-game-hack In PDF document text
    • http://librarysenior.com//repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-change-username-for-free-nanoo_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/doge-ahat-free-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/hack-account-roblox-with-link_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/free-coins-and-spins-in-coin-master_GM406889139.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_off00002edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EDB 22772 bytes
SHA-256: 4fc3bb47cd653c462c93a712ac1b732a1ab432f1fa93d5f4a1d1c21b77387437
font_01_sfnt_off00006211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6211 18952 bytes
SHA-256: 81d80c90a4a4128a9639f38bc1c4aa6c7fb5bdb976346cc77a65edfdb998c1b6

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