Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ce9d5527db1161…

MALICIOUS

PDF

45.4 KB Created: 2021-06-11 08:00:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 748945c0a1750ca190f13baa1afa4cd1 SHA-1: 56f045147b75c41d1a7daefc234633e5b1d1c3e7 SHA-256: 42ce9d5527db116191624a91d5c9eca817d899218e3f597c2bc9ff8ccf880289
160 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a 'free generator / game hack' which redirects to a malicious URL. This lure is designed to trick users into visiting a site that likely hosts further malicious content or exploits. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/free-unlimited-robux-game-hack In PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/pokemon-go-free-or-pokeball-plus_GM1094591345.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/hacks-master-coin_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/getrobux-come_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/minecraft-114-download_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/likes-for-tiktok-free_GM835599320.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/impact-minecraft-hack_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
stream_004_off000050c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C0 25920 bytes
SHA-256: 71558fbec2a282ba58ccbdca5ec32819dfd8b5804c3e2350bef8af2acec210ad
font_01_sfnt_off00008d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D40 18932 bytes
SHA-256: c9ac8ff14f07bfa737a68dd52966d36d325e06134ccd0dbc32924edcfa3e5a8c

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