Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41a15216acf1735…

MALICIOUS

PDF

34.0 KB Created: 2021-07-07 23:35:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 471eb957265d517c96d609c9ae0c5fd0 SHA-1: 5fe74dd10359b6ad67cfa7f6ed273904be7b6729 SHA-256: d41a15216acf1735ad35dae7a2eb2029b7561f7da1c2b4346f051fa131e95e61
160 Risk Score

Malware Insights

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

The PDF document contains multiple links, including one pointing to known malicious redirector infrastructure at http://netcdn.tw/app/431946152/how-to-get-free-robux-on-roblox-2021-game-hack. This lure is designed to trick users into believing they can obtain free game currency or hacks. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites or download further malware. No scripts were extracted from this sample.

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.tw/app/431946152/how-to-get-free-robux-on-roblox-2021-game-hack In PDF document text
    • http://stitqi.ac.id/website//repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/hack-roblox-jailbreak-2021-speed_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-to-get-free-robux-no-ban_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-tiktok-followers-in-5-minutes_GM835599320.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/no-human-verification_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-spins-and-coins-for-coin-master_GM406889139.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_off00002bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BF2 22656 bytes
SHA-256: b9899218aa898721d9e8150c5ac2c582b44053058e377432c4bfe587caeab336
font_01_sfnt_off00005e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E52 19460 bytes
SHA-256: a88a3b37d26ae7f28ec6954540056097f0f8d6b678a801dc09bd2df82b34d325

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