Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6635c66c408433…

MALICIOUS

PDF

44.0 KB Created: 2021-05-11 00:13:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4bc50480b381bf579c543c6904a8feaf SHA-1: f5d27f2136955e82607f5b5887fca533e890c963 SHA-256: ca6635c66c40843317de26868a95ff3cc8ac97c362c9f577c728b29f39ed54ff
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 0.9648

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-mod-apk-android-1-game-hack PDF link annotation
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/master-game_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-free-skin_GM431946152.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_003_off000047af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47AF 24408 bytes
SHA-256: 18e5bbd54652846f830fc385727ebb23fc3c100078562b9fdea7e1cd18dfe648
font_01_sfnt_off00007f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F81 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000896c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x896C 18172 bytes
SHA-256: 6afee14d26951b5f7c24a7852f92ad66fc5e87cdfe243807a436cb7752adc1d3

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