Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7cbd9aa8b9d10d…

MALICIOUS

PDF

43.2 KB Created: 2021-06-03 13:03:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 309e5f07398b793ebe812f63448e097f SHA-1: 01f4518374ed1599b9070f4bbdf69cb9b6918134 SHA-256: 1a7cbd9aa8b9d10d9a3a0f3236d0be372242091b847bcf1223cf0db67353037f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or 'game hacks'. The primary redirect URL is https://netcdn.online/app/431946152/how-you-get-free-robux-game-hack. This pattern is consistent with phishing or scam lures designed to trick users into visiting potentially harmful websites. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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.
  • 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-you-get-free-robux-game-hack In PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/is-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/freecoins_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-daily-free-spins-link-today_GM406889139.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_off00005127.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5127 26852 bytes
SHA-256: 670c1cfbd7cc5eecfce71e8fb7949381badab4505e687c1f12959e9d85e3e56a
font_01_sfnt_off00008fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC2 18444 bytes
SHA-256: d3aeb47c5138bb2f7afdc1cd1986e008461219f841fd4d3ae6acb877e9db5a0e

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