Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cbf3420766d07d…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 15:44:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c2cd367872ccc101596a7ad9539599a7 SHA-1: c03c33475f772fee0b3c79a045759be0b377c49b SHA-256: 38cbf3420766d07db8a50d4c13bf33b517e80c01b62de94d1e781cdd47c5260f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure for free game-related items, such as 'Robux', to trick users into clicking embedded links. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or phishing pages. No scripts were extracted from this sample, but the embedded URLs and the nature of the lure strongly suggest a phishing or scam 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.tw/app/431946152/free-robux-that-actually-works-game-hack In PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/roblox-fairy-tail-online-fighting-magic-hack_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-roblox-t-shitt_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-official-website_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-robux-no-verification-on-laptop_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/roblox-free-robux-online_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/how-get-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/roblox-source_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-robux-codes-mobile_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/roblox-books-online-free_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/is-tiktok-free-on-iphone_GM835599320.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-free-spins-blogspot_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_off00002f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F15 22692 bytes
SHA-256: 46941726df9a7d1fd3e104289d81d7c0c3a45b792a439acd2669c83c52412b80
font_01_sfnt_off0000620f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x620F 19608 bytes
SHA-256: d52712f1a35e8680be3c45e78173014feb66661a2560c5e73c6934237b8ae3d4

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