Malicious PDF — malware analysis report

Static analysis result for SHA-256 1520efd691159392…

MALICIOUS

PDF

45.8 KB Created: 2021-05-19 01:04:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1a898420b3a765ef9c9bb6a82e0d6864 SHA-1: 77bec9f9702780ab5fd58270ba614b77a5e66313 SHA-256: 1520efd691159392fab29b6b756e45a0ca73855a407959151abacf920462a246
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and generators. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, which likely leads to further malicious activity or compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/406889139/free-online-spins-coin-master-game-hack In PDF document text
    • http://uo-nn.ru/images/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://uo-nn.ru/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/mcpe-download_GM479516143.pdfIn PDF document text
    • http://uo-nn.ru/images/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://uo-nn.ru/images/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://uo-nn.ru/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://uo-nn.ru/images/i-want-robux_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://uo-nn.ru/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://uo-nn.ru/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://uo-nn.ru/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/roblox-robux_GM431946152.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004913.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4913 27112 bytes
SHA-256: 3cbbccfdc6159b1c629c5ae09bc2637a65c4963a260d40fed2ab66dc9b9a0ad5
font_01_sfnt_off000086d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D2 3124 bytes
SHA-256: 9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98
font_02_sfnt_off000091b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91B0 17960 bytes
SHA-256: f6240ebc11618f9bd58bbcb42a9f6a607c152d748d208013faf540cef68a2ab0

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