Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fb4f806afd1fb4…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 10:35:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 39d8a6e88d84db99f5f5c7543cd33f18 SHA-1: 15cbaa980ff20a3ae397703a118fe3fdbeb5522b SHA-256: e2fb4f806afd1fb4288cbbc2b896b003c74ecf319015c6fd53dfb6c48d1e58b9
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as "free generators" or "game hacks" for popular games. The primary malicious URL identified is http://netcdn.tw/app/479516143/minecraft-windows-10-free-with-java-game-hack. This pattern suggests the document is intended to trick users into visiting these sites, which likely host further malicious content or phishing pages. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious intent to exploit user interest in free game-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/479516143/minecraft-windows-10-free-with-java-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-a-free-home-on-roblox-on-rocitixens_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-de-roblox-2021-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/filtered-roblox-hacking_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-hax_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/can-i-have-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/black-adidas-shirt-roblox-free_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_off0000328a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x328A 23024 bytes
SHA-256: 56fcde758785e428e26b674cb35b0eacc1c268c2229ead1c38346d2638ac5438
font_01_sfnt_off000065ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65AC 19256 bytes
SHA-256: 0962a3ef6155743e3b186a790cdec45821d78640f98d60abfc6623c3622a453e

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