Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d7c77520a6089d…

MALICIOUS

PDF

46.3 KB Created: 2021-05-17 21:00:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cae9ef2215448b700f5a8555919845a7 SHA-1: f1b465e26b73f7d533c6cbf9e3bc9afc6aa69ac3 SHA-256: 55d7c77520a6089d18171840b9fad2470a91ac164e905ee8c3433eca27f7b858
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, disguised as a "game hack" generator. This lure is designed to trick users into visiting the malicious URL, which likely leads to further malicious content or downloads. The presence of multiple links to similar scam-like content reinforces this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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/coin-master-free-spons-apk-2021-game-hack In PDF document text
    • http://erptrends.com/images/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://erptrends.com/images/roblox-imagine_GM431946152.pdfIn PDF document text
    • http://erptrends.com/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://erptrends.com/images/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://erptrends.com/images/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • http://erptrends.com/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://erptrends.com/images/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://erptrends.com/images/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://erptrends.com/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://erptrends.com/images/real-robux-codes_GM431946152.pdfIn PDF document text
    • http://erptrends.com/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://erptrends.com/images/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://erptrends.com/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://erptrends.com/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://erptrends.com/images/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://erptrends.com/images/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://erptrends.com/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://erptrends.com/images/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://erptrends.com/images/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://erptrends.com/images/free-robux-hacks-no-verification_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_off00004bda.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BDA 24452 bytes
SHA-256: 1e904f5803b8b29a7c75905edb34d05daa83bc7852d7ca37392a1a08380fd15c
font_01_sfnt_off000083ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83EA 4112 bytes
SHA-256: 0274289053276fcca1662016432a12ba13b17554af790a2cefde3f7e9963af0a
font_02_sfnt_off000091e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91E9 18456 bytes
SHA-256: 29cdb33c079fef0813399b5d3456e0cee6bb382532089b205a8c189028fb290e

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