Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d730507bdba2c1…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 20:53:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9f50fdd9824b6eb6991048d75c5cc27f SHA-1: ecfb4efa4f56cc30465c7c37ae8be01a5190aa91 SHA-256: 13d730507bdba2c1d9b218117c3c08b97bb6674b81526ba85e0d0a9a910605c9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free generators to entice users to click on embedded links. The primary link, http://netcdn.tw/app/431946152/free-roblox-toy-codes-not-used-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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-roblox-toy-codes-not-used-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/airport-in-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/kron-hack-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-script-injector-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-groups-with-funds-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-kids-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/installer-un-cheat-roblox-pour-avoir-largent-illimit_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hacks-for-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-hack-roblox-games-without-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-1b-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-hack-an-roblox-account-2021-november_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-audio-hacker-in-the-server_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/is-minecraft-free-on-switch_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_off0000329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x329C 22988 bytes
SHA-256: 851629e59f23eb12fae0a9f5a6a3565911760be0bd018a7bd473e6708f6818e9
font_01_sfnt_off00006621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6621 19108 bytes
SHA-256: 7e46580f317f2341111cc3e3bb4543cf5aa0b0f80032ba117b7a990766b99810

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