Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61953190c319f50…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 14:22:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6bcceab9c6abb9db534046522a0ab730 SHA-1: cb42780890e123b1992bc530e1f234481820f449 SHA-256: a61953190c319f505938e9e38054c02b2c1e6314c652a0e2642f27294bddb262
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free game hacks and spins. The primary URL identified, https://netcdn.online/app/406889139/free-spins-coin-master-2021-game-hack, is flagged as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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.online/app/406889139/free-spins-coin-master-2021-game-hack In PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/script-for-pubg-uc-hack_GM1330123889.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/pokemon-go-free-offers_GM1094591345.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-free-online-no_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e5f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E5F 23976 bytes
SHA-256: 0f1f8ab05a1c21cef4808c3ea61d400bc12c519f8ce6455986820ac7bb0b08d5
font_01_sfnt_off00008532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8532 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off00008f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1D 18288 bytes
SHA-256: 9732707b45c862b7a6ef8ea2418900def9be3650c6b325207d932644f64622ad

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