Malicious PDF — malware analysis report

Static analysis result for SHA-256 c220b3d0861a1085…

MALICIOUS

PDF

44.1 KB Created: 2021-06-04 01:16:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d06a380d84a9eb1fa2628f3d0c030284 SHA-1: 5737c10952f0920b0a2721a784c90beee451e4f2 SHA-256: c220b3d0861a10850eae1dd8261b8f82e73f27bc5341e38436424a53315abc5c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to a known malicious redirector, disguised as a 'free Robux generator' or 'game hack'. The document body, though heavily obfuscated, contains a URL that aligns with the heuristic findings. The primary goal appears to be tricking the user into visiting a malicious site, likely to download a second-stage payload.

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.online/app/431946152/free-robux-without-human-verification-game-hack In PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/village-4-coin-master_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/how-to-get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/free-admin-roblox_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/pokemon-go-free-clothes_GM1094591345.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/roblox-cp_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/ww-robux_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_off00004f20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F20 24512 bytes
SHA-256: 2f8ceccbe072de5153a68de1f0b9e49e26fb882dde36dc6d9741e8164381d15c
font_01_sfnt_off00008724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8724 19224 bytes
SHA-256: 69162c0303826e3a88150cee7b6b12b50ba56e04bc46253c0e5eb9f80ac8a399

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