Malicious PDF — malware analysis report

Static analysis result for SHA-256 943aa9651524e2aa…

MALICIOUS

PDF

34.5 KB Created: 2021-06-28 06:49:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e3931b83fbe7dbfb114209096d0079b2 SHA-1: a7edb81b2bf370833f45fafca34c221dc9a135ee SHA-256: 943aa9651524e2aad5b15403d981993aa74d8c9cdecca52c8b5a42451d983e75
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to sites offering game hacks and cheats, such as for Roblox and Coin Master. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a likely phishing or scam attempt. While no scripts were extracted, the document's structure and embedded links strongly suggest a lure to malicious websites, likely for credential harvesting or malware delivery.

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-hack-into-roblox-accounts-2021-game-hack In PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/interviewing-the-roblox-hacker-who-bots-his-games_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/hack-to-join-flamingo-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-prove-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/robux-hack-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/all-mobile-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-get-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-cheats-free-spins_GM406889139.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_off00002f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6E 22144 bytes
SHA-256: 2c8f0c554b1d0a0a1c9697393fdaaa45bba246cd179b0dc321d5deeca5e3398a
font_01_sfnt_off00006059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6059 19468 bytes
SHA-256: 1caa0f9e81d8424f632562353e710bb8562bafb9623bc3057d3e8606e307b08e

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