Malicious PDF — malware analysis report

Static analysis result for SHA-256 de826e509c321e05…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 14:59:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0a038c20dbc976f9f577ef1a697dce01 SHA-1: ffc8c4ec90618875af1a1c3326c244be65da1798 SHA-256: de826e509c321e052431954e0b4b2d86f789a7d87e823fb68f28c9d747a881e0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'game hacks' and 'free generators' for popular games. The primary lure directs users to 'http://netcdn.tw/app/406889139/coin-master-fan-club-game-hack', which is flagged as a malicious redirector. The document body and heuristics indicate a social engineering tactic to trick users into clicking these links, likely leading to malware download or further compromise.

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/406889139/coin-master-fan-club-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-hack-no-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/do-this-for-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/counter-blox-roblox-offensive-cheats-download_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/hacks-de-roblox-para-cualquier-los-juegos_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/comment-hacker-un-conte-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-wings-codes-free_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-empty-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/broken-bones-4-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/pokemon-go-hack-free-pokecoins_GM1094591345.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-music-cheat-codes_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
stream_002_off00002df1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DF1 22876 bytes
SHA-256: 57edd5b867c414d2d5ede01d52d9d05e3fc5adcdcbdb92c85021ee04dda51875
font_01_sfnt_off00006149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 18372 bytes
SHA-256: 22074970575eadcad87cb52a622e0a0fed1ce08607426e4f3de5779985964155

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