Malicious PDF — malware analysis report

Static analysis result for SHA-256 79195e25879a67f7…

MALICIOUS

PDF

41.7 KB Created: 2021-05-14 18:19:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 11a4309855d0b4dc7cef00ca367e519c SHA-1: 0833b0bc52bfc97a0864888c97088acd9a70fcb5 SHA-256: 79195e25879a67f70fe232fbcabfcfe8d505c5e05f8b19f4b53b00495d303981
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.xyz/app/406889139/coin-master-hack-tool-exe-game-hack PDF link annotation
    • http://yochin.org.tw/images/no-human-verification_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/robux-free-com_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-place_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/give-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-play-roblox-for-free_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_003_off000048fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48FB 24640 bytes
SHA-256: 788582a7125b20e1557e2efee2260ddecf706a5f3f6e1e852f40f0db339a38de
font_01_sfnt_off00008140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8140 18000 bytes
SHA-256: 4986d21a4b5a0dd9c27fb69bc80aac457c531d809421d21d3eeb28a335a679e5

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