Malicious PDF — malware analysis report

Static analysis result for SHA-256 71edc82a1d0244d0…

MALICIOUS

PDF

34.8 KB Created: 2021-06-21 12:49:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 893614e472dcb4e1555cf55eae6b8fcc SHA-1: d1e612857d3c550c0a087cd857ab43e0a3a12c39 SHA-256: 71edc82a1d0244d0c7c20fd062bf31a57569778357328cd0c929915af06bc78d
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 advertising free game currency and hacks. The document body and embedded URLs strongly suggest a lure to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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-20210-robux-game-hack In PDF document text
    • https://wenshan.com.tw/upload/files/download-roblox-free-studio_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/roblox-is-it-free_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-find-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/salvage-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/roblox-catalog-free-wings_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-hack-roblox-to-have-gun_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_off00003143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3143 22248 bytes
SHA-256: 71d3290d6eff6fe02166e49a2497d5f7f034a0db6a2c6225fb02c7b0d258b600
font_01_sfnt_off000062bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BD 19116 bytes
SHA-256: af14d1fa5b4f919e14fbfd2207fee29f86c7e1258ad11836ead4aea48baef512

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