Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca486572ec90e6a…

MALICIOUS

PDF

44.9 KB Created: 2021-06-11 01:55:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 42a37b0e930b8d7c3e66f323c029f71f SHA-1: 096db99ff4e3f91efc264616f2b67cdd6e604061 SHA-256: aca486572ec90e6abad5072cf30c2c3ee1a11dc0edd951f6c26878d38b432595
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' or 'game hacks' for popular games. The primary redirector URL is https://netcdn.tw/app/431946152/roblox-com-free-stuff-game-hack. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings strongly indicate a social engineering lure designed to redirect users to potentially harmful websites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-com-free-stuff-game-hack In PDF document text
    • http://smpn1sda.sch.id/slims/repository/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/get-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/honest-robux-hack-may-2021_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • http://smpn1sda.sch.id/slims/repository/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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
stream_004_off00004e87.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E87 27852 bytes
SHA-256: 446a7bcff11215f5df168952487d03e9fe463710790f1e6f1df60d6a07c84b26
font_01_sfnt_off00008c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C89 18452 bytes
SHA-256: acfc47223c993beb1455988e6ddc884ea4d44c1e0ee4a50ff0c692ce20871fca

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