Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c47ae03dd5d125…

MALICIOUS

PDF

44.7 KB Created: 2021-06-10 22:29:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c4a3795732f97e370a17f17a34bb8a05 SHA-1: 6a8c02c66a3bc440a8f758961e1a97eb930ed50c SHA-256: 83c47ae03dd5d125f93120c59d61cabb46388465366768437093a23e4216681e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector lure, specifically referencing 'free generator / game hack' content. The embedded URL leads to known malicious infrastructure. Although no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/tshirt-adidas-for-free-roblox-of-2021-game-hack In PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/is-pokemon-go-free-on-ipad_GM1094591345.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/pokemon-go-free-99_GM1094591345.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/minecraft-114-download_GM479516143.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/pubg-uc-hilesi_GM1330123889.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/tiktok-free-advertising_GM835599320.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/cute-hacks-for-roblox-royal-hjigh_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan//repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://labfisika.undiksha.ac.id/perpustakaan/repository/coin-master-hack-apk-july-2021_GM406889139.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_off00005051.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5051 24896 bytes
SHA-256: 38dfe032c475d039fc413c3fc1162ec7140507c3c5489722b4174d9b626e6e8a
font_01_sfnt_off00008998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8998 19140 bytes
SHA-256: ab910cca55c34d3c494e5cb9bb64431eef4f377a089071a6f74b6563106efbd1

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