Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40ab81f3ced863c…

MALICIOUS

PDF

49.1 KB Created: 2021-06-08 16:09:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 24cb02175c21033327822da26d3b2c28 SHA-1: 75029fb3ca425f015621b63ff751a69d1ef99354 SHA-256: b40ab81f3ced863c2c787866ed993baf691faed25b6001bfb67efff6ccb254df
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically targeting users with lures for game hacks and free currency. The heuristic firings confirm the presence of malicious redirector links and a general lure for game-related cheats. While no scripts were directly extracted, the PDF structure itself facilitates the redirection, likely leading to a second-stage download or phishing page.

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/vortexx-free-robux-game-hack In PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/how-you-get-robux_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/pubg-uc-malaysia-murah_GM1330123889.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/pubg-uc-kuwait_GM1330123889.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/roblox-free-followers_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana/repository/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://stiepariperpus.web.id/sarjana//repository/roblox-free-skin_GM431946152.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_off0000521a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521A 26732 bytes
SHA-256: 1e59971e6c7bea7915e53d25349917e7714b67f138a97d4d9b61b7fb719fe3a0
font_01_sfnt_off00009024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9024 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D36 18252 bytes
SHA-256: 4001d1cea68fbaf22e4d0410300cc8003dfed932f7a4ec96cf7e8c4b382a35f7

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