Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c5831c7a152e56…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 02:42:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 445dd800e274e521bb1b09a0c3a51e9d SHA-1: 29a477a9162f51f2cc95f51631dfbb66d539b05e SHA-256: 16c5831c7a152e5677ac3bd40442c9f21090c8aa9e8e8bde1b43ed43c18d46ab
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game hacks, which redirects to a known malicious URL. The ML classifier also flagged this PDF with high confidence. The embedded URL in the document body, http://netcdn.tw/app/431946152/robux-for-free-glich-game-hack, is the primary indicator of malicious intent, likely serving as a redirector to a phishing or malware download site.

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.tw/app/431946152/robux-for-free-glich-game-hack In PDF document text
    • https://fridaytravelnepal.com/userfiles/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/aos-hack-roblox_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/tiktok-free-80_GM835599320.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-prison-live-v20-infinite-ammo-hack-2021_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-re_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-roblox-girl-clothes_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_off00002fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC8 22308 bytes
SHA-256: cc5e8674f5dbe88089ba924ab0bdd05cc881fe7ce3bed7bccbb300468b585252
font_01_sfnt_off0000612e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612E 18892 bytes
SHA-256: 27ba8af0ae8aa05f2d4f4d43dd242e9bd11463d13fa1ca9c35eaf7a71f32576b

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