Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7f866687b6af99…

MALICIOUS

PDF

44.2 KB Created: 2021-06-11 12:13:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: de1dbe7ef3017c18318c8ae563b16fc2 SHA-1: a600ed05a443ac16a296feb42b61edb87defc435 SHA-256: eb7f866687b6af990d4202e159cd60bd8a8e26565f25fd822fb7f00e70770836
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to a malicious redirector, specifically promoting a 'game hack' lure. The document body, though partially garbled, contains the same URL, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

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-hacks-for-mad-city-game-hack In PDF document text
    • http://library.umla.ac.id//repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-how-to-get-stuff-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/mcpe-client_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-robot-animation-pack-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/blox-world-free-robux_GM431946152.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_off00004df5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DF5 25236 bytes
SHA-256: 9f73f86c678cbb1aa08f0d03900b905de819860cbd18d89b76f95062f81bb39c
font_01_sfnt_off000087ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AB 19120 bytes
SHA-256: d55b35956c57711de90e4b825c2b03623316527b255a6427a90be0e507126709

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