Malicious PDF — malware analysis report

Static analysis result for SHA-256 c134d19728773bf6…

MALICIOUS

PDF

48.9 KB Created: 2021-06-09 05:00:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9cb88309e0955dfd583d9e60cae284d5 SHA-1: 2f36047b5112f0896f2cb188642f5610088e359a SHA-256: c134d19728773bf6e5e124a66f96d97eb951437a1bde0df2df3d00227b47b2d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and free generators. The primary malicious link identified is https://netcdn.tw/app/431946152/rose-v1-download-roblox-hack-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.tw/app/431946152/rose-v1-download-roblox-hack-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/oginject-co_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/jailbreak-script_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-hack-tool-no-human-verification-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/100-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_off0000533d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x533D 31848 bytes
SHA-256: 345eea23f9728a4a50ee27157d6894ccdc87b602853fb835fda762355454f260
font_01_sfnt_off00009a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A92 18928 bytes
SHA-256: b5b72348e44c7e0416e86e5473683dca0460a6ba23225ff53c6cede89c94e4f1

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