Malicious PDF — malware analysis report

Static analysis result for SHA-256 78494510794b7008…

MALICIOUS

PDF

35.5 KB Created: 2021-07-08 18:15:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 164f7f198e3db64764abb2d36379d368 SHA-1: e4bd640020cf0896d1cf9a351a41b8c71aeb2f55 SHA-256: 78494510794b7008dd3cfdbf4ef74db75c32b07e18d4764d1a186f0cfa3bc474
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure and external sites, masquerading as generators for free in-game currency and hacks. The primary link, http://netcdn.tw/app/431946152/how-to-get-free-robux-2021-easy-game-hack, is flagged as a malicious redirector. The document body and embedded URLs strongly suggest a phishing or scam attempt to lure users to malicious websites.

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/how-to-get-free-robux-2021-easy-game-hack In PDF document text
    • https://nhaphangjapan.vn/public/upload/files/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/roblox-how-to-get-the-animal-hoodies-free_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/how-to-have-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/easy-robux-generator_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/lyce-de-roblox-2-hack-director_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/how-get-free-follower-roblox_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/como-poner-hacks-en-roblox-en-orenador_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/coin-master-level-4_GM406889139.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/roblox-free-script-executor-2021_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/pokemon-go-free-7-km-eggs_GM1094591345.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/roblox-jailbreak-redboy-hack_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/how-to-get-100k-robux-free_GM431946152.pdfIn PDF document text
    • https://nhaphangjapan.vn/public/upload/files/how-to-get-a-free-backpack-in-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A6 22544 bytes
SHA-256: bfb3b44269065c889b27c0186828b66d37e257fe81ea5aba189be19ab4cc23d6
font_01_sfnt_off000063fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FB 19568 bytes
SHA-256: 54573245d87bf425d09f38ae69d600f60ea89f6a8aa7cff0a6b46d42a5179ab9

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