Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdde01362c0d46fe…

MALICIOUS

PDF

48.5 KB Created: 2021-06-11 04:39:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 533cd12b0085e0381277c5c2f47ed14e SHA-1: 4a2049a0edad9e61fe426520ac7a099288e55ea5 SHA-256: cdde01362c0d46fee123c479781b9781576b9ba3f69affba368b30161fc31266
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically promoting 'free generators' and 'game hacks'. The primary URL identified, https://netcdn.tw/app/431946152/bleu-roblox-mega-free-2021-game-hack, is flagged as a malicious redirector. While no scripts were extracted, the document's structure and embedded links strongly suggest a social engineering lure to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/bleu-roblox-mega-free-2021-game-hack In PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-roblox-hack-download-2021_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/roblox-pet-simulator-free-game-passes_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/hack-pour-roblox-farming-simulator_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/roblox-scripts-changer-cheat_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50B8 27684 bytes
SHA-256: 6aabc43dfaed5e106b5f1644479b562c273d5024be44ec95845d07ae22971e43
font_01_sfnt_off00008e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E38 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off000097e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97E7 19204 bytes
SHA-256: 6fdb3cfaa93a364a916204f123b0c59f294461f1a0d7ea1dfe68bb5162328250

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