Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f86ae79e8cfb37…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 21:05:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1cdcef2f388576b0946202ef83ef02bc SHA-1: 6fa10f76e62410b7ec37583efc53eb123e49bec4 SHA-256: d4f86ae79e8cfb377a456a94705ba5ab5ecf29f2cf13eb011f6c334b1bdd28f1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/earn-robux-by-watching-ads-game-hack. The document body and embedded URLs suggest a lure for free in-game currency or hacks, which is a common social engineering tactic. The ML classifier also flagged this PDF as malicious.

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/earn-robux-by-watching-ads-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-account_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/cheat-codes-for-hoes-roblox-id_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/cheat-codes-for-skywars-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/cheat-codes-for-superhero-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/blue-scythe-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-free-items-glitch-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/easy-robux-com_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-account-for-roblox-infinite-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-executor-free_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-roblox-shirt-designs_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-codes-wiki_GM431946152.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_off00002f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F27 22048 bytes
SHA-256: 1509fb929e23b4e8b58d1727767fa04d42fd05f4b29d27f975f5972b815e1738
font_01_sfnt_off00005fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAE 19492 bytes
SHA-256: 6accebd3176df4525d0b6b61c4a2189885d974444c570743fb38c2e38d67c57f

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