Malicious PDF — malware analysis report

Static analysis result for SHA-256 51758f4c034e61f4…

MALICIOUS

PDF

34.9 KB Created: 2021-06-25 07:05:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 82af2d1c1e1fa2c6fffa96ab79460b47 SHA-1: c8a558c6d34161035ae2bd22868b85885a0e39ce SHA-256: 51758f4c034e61f46db0f584281d171065ef286a870a2faccb800061d9db7680
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a known malicious infrastructure, masquerading as free game currency generators. The heuristic firings indicate the PDF links to a 'free generator / game hack' redirector, and an ML classifier also flagged it as malicious. The document body explicitly contains the lure text and the malicious URL, suggesting a phishing or scam attempt.

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-to-get-free-robux-2021-without-builders-club-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-no-clickbait-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/download-apps-for-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-home_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-generator-tool-download-link_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-hacks-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hack-de-roblox-de-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-hack-how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-in-2021_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E4B 22512 bytes
SHA-256: 23cdad4896fec0a878a6a13a5a1162808f41d7a6e27fb6ec4feee5c99b4f35b2
font_01_sfnt_off00006032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6032 20120 bytes
SHA-256: fe2d09c2a3fa4840c7dfafaa45e9c96a77359b83b76e8f65f2de8a9936fa821f

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