Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c635c6b5ba3a103…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 06:25:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b78392cdef7241efd204d80bed7a3ab1 SHA-1: 5028d41ab4145eaa07a11da5e56c1309588190c5 SHA-256: 8c635c6b5ba3a103bcf55dfdc60fc58d2eefe98f110c6cd31bb88b17b43ea57d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of free in-game items. The document body, though partially corrupted, contains text related to 'free bobux' and a URL that aligns with the heuristic findings. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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-bobux-game-hack In PDF document text
    • http://www.perpus.stfm.ac.id/repository/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5078 25184 bytes
SHA-256: 8ffe29a02570dde3d2aa52fd49786fa187f8f8b6b0fba3756185a7ec563b1e39
font_01_sfnt_off00008900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8900 2836 bytes
SHA-256: e6aea2daa5db9355830a9a968e1dd4db55accb324ce868326bbb9f42b5e0b8b4
font_02_sfnt_off000092a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92A5 18012 bytes
SHA-256: 21a070aee0b4453f2f1d9cb5d53691f71c1a468eb04f2ae46e30da6bacbd91e9

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