Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef97e718d4cc7b7…

MALICIOUS

PDF

44.2 KB Created: 2021-04-26 20:47:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b5d034ecbfb975ae83508e34b4ccb080 SHA-1: e8298bdb902519ae404a2d8466ba2ae74c42ba1f SHA-256: 9ef97e718d4cc7b7f679ade085b35289968a26f5b168072967fe877cd38846f9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency ('Robux') and hacks to entice users. It contains multiple links, including one to a known malicious redirector infrastructure, which likely leads to further malicious content or downloads. The ML classifier strongly indicated maliciousness, and the presence of redirector links supports a phishing or scam-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.xyz/app/431946152/robux-hack-no-human-verification-or-survey-2021-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/apk-roblox-mobile-hack.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-sex-games-free-entry.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/can-you-get-free-robux-on-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-roblox-on-android-tablet.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-hack-2021-free-robux-generator-no-human-verification.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/synapse-roblox-free-no-virus.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/como-hackear-cuentas-de-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-do-you-hack-to-hack-on-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/unlimited-jump-hack-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/c-roblox-exploit-free.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_003_off0000426c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x426C 30044 bytes
SHA-256: d0744c98a83d2d4e3d29ae3e2f38e1132fed473d5ebe1b48c6d7ef4426c7f407
font_01_sfnt_off0000875e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x875E 19560 bytes
SHA-256: 489e753cea5114d57cbe25ae7709c12c41e740c5405d0694f47824ae542b7faf