Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c3d8bfac77004f…

MALICIOUS

PDF

34.7 KB Created: 2021-06-27 08:37:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6170f43a7342f2944b622af2f90ba37c SHA-1: ef6beaeb8695283199527c431ad4859b66750721 SHA-256: 38c3d8bfac77004f236009bf66781955d28118f77e8dd2adeb305eebbfb284c6
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirector infrastructure, specifically http://netcdn.co/app/431946152/builder-assistant-roblox-free-game-hack, which is flagged as a malicious redirector. The document body and heuristics indicate a lure for 'free generators' or 'game hacks', suggesting the intent is to trick users into downloading or accessing malicious content. No scripts were extracted, but the presence of malicious redirectors and lure content strongly suggests a phishing or malware distribution attempt.

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/builder-assistant-roblox-free-game-hack In PDF document text
    • https://domc.tw/upload/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/hack-para-roblox-dragon-ball-z-rage_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • https://domc.tw/upload/files/free-roblox_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-now_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/comment-hacker-mad-city-roblox_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/how-to-get-free-robux-ad-on-youtube_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/master-coin-hack_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

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_off00002fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAE 22524 bytes
SHA-256: fa12acd15d76ea3e4250a4390e3b71bcd68cf95f3a4b1f1cc40c4f8826fab314
font_01_sfnt_off00006220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6220 19188 bytes
SHA-256: 153d57f445d104fa9573de2d7bd195e34c0d2f8b21eee876aaf7a5e13c861869

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