Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50cc0dbe3b38151…

MALICIOUS

PDF

45.3 KB Created: 2021-06-08 17:32:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e8b704fb85b8461164f932cf00072f7a SHA-1: 78748df08b0c22426a4f702df3ea1253c506c736 SHA-256: b50cc0dbe3b3815109976fb8a1ffecdc04539f0fdad429cb8d1e7278528c8ddf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, disguised as game hacks or free generators. The primary malicious link identified is https://netcdn.tw/app/431946152/shirt-template-roblox-free-shipping-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering lure to a malicious website, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/shirt-template-roblox-free-shipping-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/tiktok-free-google-home-mini_GM835599320.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-spin-link_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-hack_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_004_off00004fe6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE6 26116 bytes
SHA-256: 3cd952822d493c14a500fd24a81731109ca4863fb5250bca39432a5fab056c48
font_01_sfnt_off00008bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCB 19292 bytes
SHA-256: d968b2dbfb82e9cea888e5d7d54a5d854a688afceca2fd22714a57c9bac23f5b

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