Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a78efd3cf31cb2a…

MALICIOUS

PDF

35.0 KB Created: 2021-07-01 21:56:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4375c69957a249ede4512e8288998cbf SHA-1: 131d9a715d795b43a37a9c49bc0c617bbe2137e9 SHA-256: 5a78efd3cf31cb2a9c035be12bc82d79b50f4120c9c0715a50552107a2d2b2c4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as game hacks and free item generators. The primary lure URL is http://netcdn.co/app/431946152/hack-for-apocalips-rising-roblox-game-hack, which is likely used to deliver a second-stage payload or redirect to a phishing site. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a malicious redirection workflow.

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.co/app/431946152/hack-for-apocalips-rising-roblox-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/free-items-from-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/pokemon-go-free-pokecoins-xyz_GM1094591345.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-information_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-money-for-roblox-lumber-tycon_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hown-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-gift-card-generator-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-game-thumbnail_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/f3x-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-in-roblox-2021-pastebin_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-for-free-without-downloading-apps_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_off0000300a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300A 23040 bytes
SHA-256: f2d719bfc57fbae4547c6e354839261756d1641a01381358bbc795f8004be789
font_01_sfnt_off000063ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AB 19116 bytes
SHA-256: 40cd6aeb0a26944c993bbc4206689f69a6c74cd56e6069e94696872eecc840fe