Malicious PDF — malware analysis report

Static analysis result for SHA-256 7831ddb81ab8db3a…

MALICIOUS

PDF

34.6 KB Created: 2021-06-18 03:44:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d3a90f9c5070af781d462a46c36cfd0a SHA-1: c639add3e4b2a50adb46f56af57dc0966aeeb27a SHA-256: 7831ddb81ab8db3a3c9a99a510566d2bf4300f63a92e8745c2607261c3e17bab
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising free Robux and game hacks. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lure users to malicious sites. No scripts were extracted, but the presence of malicious links and the lure content indicate a high likelihood of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-do-i-get-free-robux-tix-and-obc-lifetime-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-roblox-and-get-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/instantrobux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF2 21880 bytes
SHA-256: a432d30b25f3c1b3341a4b4a3377434d48ad2ce2c2f9aceef858b58809aa071c
font_01_sfnt_off00006021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6021 19708 bytes
SHA-256: e7b8922a93a75eb196258ce313a4bbdb0bebb4971c9ea28d879d9c62de3eeada

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