Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef400d3657925932…

MALICIOUS

PDF

42.7 KB Created: 2021-06-11 01:28:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 809e0295e14cb6da032916f709d75f88 SHA-1: d0f87ec647b4adad8cea3a3d2828adbeb1d5403b SHA-256: ef400d3657925932588492c5d7030da9d7faefabcbd988e1feb4ed8c9ccdd652
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting a 'free generator / game hack'. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user into clicking a deceptive link, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 3

  • 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.
  • 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 https://netcdn.tw/app/431946152/free-megavore-roblox-dinsaure-game-hack In PDF document text
    • http://stitqi.ac.id/website/repository/robux-gratis-con-cheat-engine_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/roblox-earn_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/robux-xyz_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-robux-websites-2021_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
stream_004_off00005156.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5156 25004 bytes
SHA-256: aaa3bc86ba99cfb18ea09f81afaf718905d8e33fed9faa5d33f02148aef67280
font_01_sfnt_off00008a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4D 19204 bytes
SHA-256: 29a6a93edcc984ecac60d3c64af8f9997d01bb3dd36c4c5ef1db56037fc95de7

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