Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffdc7c44ef833b8…

MALICIOUS

PDF

35.7 KB Created: 2021-07-03 11:51:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a256186f1db7b7d185260408c7bcacfe SHA-1: 27cc85e51a9939fa0a21a9ff647358025e855d98 SHA-256: 7ffdc7c44ef833b80938c02807fa5d45b8b91916561dc2bb94265eaacf7bdf28
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 infrastructure at http://netcdn.tw/app/431946152/free-robux-generator-for-roblox-2021-game-hack. The document body explicitly mentions 'Free Robux Generator For Roblox 2021' and 'game hack', indicating a lure for users interested in obtaining in-game currency or cheats. The presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

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/free-robux-generator-for-roblox-2021-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-builderman-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/esp-roblox-hack-arsenal_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/gift-card-generator-hack-robux-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-sued_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-earn-free-money-tower-battles-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-download-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/youtube-be-a-parkour-ninja-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/vermillion-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/pixel-art-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
font_00_sfnt_off000030c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C3 23292 bytes
SHA-256: d4f266e3724aa00b4c677c2e4acfe6f4b7f0a186137ee0a3a7478ac2543beeb8
font_01_sfnt_off00006580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6580 19296 bytes
SHA-256: 1c5b5ef18537994d2b9d4bcfadda653dfd61b801510ea22c778e1317dc9212ff