Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5c2e52155d58ce…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 07:16:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7f1a7a28f07cfed9055900a5cf33ff9d SHA-1: 1388afc1414cb27619aadfffe16a4b08499174eb SHA-256: df5c2e52155d58cedbeb21d92448dbc360d64f13104c58ae637cbfadfb633a21
160 Risk Score

Malware Insights

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

The PDF contains a lure for a game hack, directing users to a URL associated with malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. The embedded URL is designed to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/479516143/minecraft-pocket-edition-apk-free-download-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/pubg-4all-cool-20219-uc_GM1330123889.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/pokemon-go-free-event-box_GM1094591345.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coinmaster-links_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_off0000505c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x505C 25300 bytes
SHA-256: 98dec438aa45fd48cac83921997abb1e61acf7cbbc01afa6cdf406877e2c1b22
font_01_sfnt_off00008a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A85 2856 bytes
SHA-256: 20dc0c19885f9eb84a70adf762c7af2bb5b336981fcfa4d14a25b177438c211a
font_02_sfnt_off00009459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9459 18788 bytes
SHA-256: 367056a754561f937df838296582abd38218f74b4e704aecd9863e26c36099d2

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