Malicious PDF — malware analysis report

Static analysis result for SHA-256 6837b458dbc6a2f5…

MALICIOUS

PDF

41.5 KB Created: 2021-05-12 08:32:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fbb95dcd4abf8e73511b8eac31729a24 SHA-1: 504d1dd9f7399494a322fcc707f4774797a90ab7 SHA-256: 6837b458dbc6a2f5e68d3e62fdc4159defa870adb0fc94c34514d1a6da6e74bd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free generators' to lure victims. The primary malicious URL identified is https://netcdn.xyz/app/431946152/how-to-hack-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or redirection attack, likely intended to lead users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/how-to-hack-robux-game-hack In PDF document text
    • http://smkn1salatiga.sch.id/library/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/minecraft-112-hacked-client_GM479516143.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_off000046ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46EC 24612 bytes
SHA-256: 05e5673191219c7107bdd279f9d2e241d8523b3a047861ffc4163c76cf7ea5c6
font_01_sfnt_off00007f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5D 18412 bytes
SHA-256: 799ae8847f356c5b4d712fc876b96dd84d848442331064266ecb6e470ae97e62

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