Malicious PDF — malware analysis report

Static analysis result for SHA-256 c578eb052d0c4898…

MALICIOUS

PDF

53.2 KB Created: 2021-06-03 19:08:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 193aa302382226190fb6d0b46e753d13 SHA-1: d408e9b9dedd8439bd235eaf2822bb5624ea1100 SHA-256: c578eb052d0c48982b0d847bbedf2eb38af918acc7cd23a593789f9a152cdc99
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors, disguised as 'game hacks' or 'free generators' to lure users. The primary malicious URL identified is https://netcdn.online/app/431946152/how-to-hack-roblox-accounts-using-sql-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a phishing or redirection attack. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9616

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/how-to-hack-roblox-accounts-using-sql-game-hack In PDF document text
    • http://www.flytec.com.py/download/files/free-likes-for-tiktok_GM835599320.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/pubg-40-uc-buy_GM1330123889.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-to-get-stuff-that-cost-coins-free-mpe-master_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
stream_004_off000054a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54A1 26544 bytes
SHA-256: 0fa70a4b9a5425b8c69d313760527e92b95866b377c6ee796003bb2e99694a04
font_01_sfnt_off000091af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91AF 7420 bytes
SHA-256: 0b188308ab0e7ffce9913d63d697a586f2937cafc51a771db38e3a566cd37e24
font_02_sfnt_off0000aa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA1F 19352 bytes
SHA-256: 3b30a777ceafb65566643b5e69d80f2966526c29d2d7e59331dfee791aba680e

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