Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe098ff6438a0e38…

MALICIOUS

PDF

46.8 KB Created: 2021-06-09 14:54:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2e891b857b6d9abe92789d3d5fd6fd84 SHA-1: 4333d26592ccaa4525bb75124225fa9f8e365b9a SHA-256: fe098ff6438a0e389ebe4e6467cae76ad940f3248f69c778b9c2cf0207338a5d
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 game hacks and free generators. The primary link directs to 'https://netcdn.tw/app/431946152/seraph-roblox-download-free-game-hack', which is flagged as a malicious redirector. The document body, though partially corrupted, contains references to similar lures and URLs, reinforcing the malicious intent. No scripts were extracted, but the embedded links are sufficient to indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/seraph-roblox-download-free-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/best-hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/freerubux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-rape_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-gun-games-free_GM479516143.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
stream_004_off00004e91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E91 24872 bytes
SHA-256: 8b885595b83d80606afb2516c57f0901d7323ce3b16eb2553946619efc5eb1ff
font_01_sfnt_off00008738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8738 3096 bytes
SHA-256: d05729863dc05721ada29044278030255eeda038236568e8246a87d3a8573d6e
font_02_sfnt_off000091e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91E3 19024 bytes
SHA-256: 6f0c51e476f9db542c7324746623114a271538f97cbb63ec0a2f41ef3825a98c

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