Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5f5cff8cffd504…

MALICIOUS

PDF

44.4 KB Created: 2021-05-16 08:08:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c3e12af3edd9753d16ca1adffb181c12 SHA-1: 22b8acb5f9279076e133df35662dbf43dc0c5b49 SHA-256: cf5f5cff8cffd50418b6994d6fd994a816f17fdb8393dbe1a46bd78ca00caf9f
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 0.9632

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-to-get-free-spins-game-hack PDF link annotation
    • https://dentmate.com.tw/image/data/files/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/static-moonactive_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/robux-scam_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/static-moonactive-net_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-minecraft-codes-2021_GM479516143.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_off000048cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48CB 24900 bytes
SHA-256: adeb0d3dee5692f291fa85b7f48cc382f25dac007f4cc48a484e3ac0147d49c9
font_01_sfnt_off0000820f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x820F 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC1 18056 bytes
SHA-256: 6ebf753f6e2aa75b7f89159318a8360a057196b850713683f584e5709dbcaa9a

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