Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e71b1a3cf23cc0…

MALICIOUS

PDF

35.0 KB Created: 2021-07-02 05:57:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d8c85f887aaf35470e456f8bc4886f33 SHA-1: 28948f47937efc018a1fbb9dc859e229fcc7fa06 SHA-256: a3e71b1a3cf23cc041a90ea9e84c4aa83fd4a1381db77858430b292030ee2826
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/free-customize-roblox-skin-game-hack. The document body and embedded URLs suggest a lure for game-related cheats or items, a common tactic for distributing malware or conducting phishing. The ML classifier also strongly indicated maliciousness.

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/free-customize-roblox-skin-game-hack In PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/getting-free-robux-on-a-website_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/how-to-stop-hackers-from-hacking-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/roblox-jailbreak-hack-2021-speed_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/freespinandcoin_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/free-commands-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/how-to-get-free-outrageous-builders-club-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/survivor-hacks-script-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/free-roblox-promo-codes-2021-february_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/cheat-engine-la-roblox-para-hilesi-nasil-yapilir_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/free-robux-no-survey-and-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1enrekang.com/__statics/gudangsoal/files/roblox-ninja-dojo-tycoon-cheats_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_off0000315b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x315B 22112 bytes
SHA-256: 933d9b3d4277a60b5e54ff734338b214163b4d79e35dfafa96e99e8dfbbaa752
font_01_sfnt_off0000626d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626D 19528 bytes
SHA-256: 5cffa58ce19b8db0f40fede0a81fa888af1019ebd720b6166d30a44766801005

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