Malicious PDF — malware analysis report

Static analysis result for SHA-256 427cc8525a8bd8b6…

MALICIOUS

PDF

39.0 KB Created: 2021-05-24 00:17:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9fed332a114db178787f296645f13b3e SHA-1: 22a03f65a08ff2ee18971fba1101f6caadb57ecb SHA-256: 427cc8525a8bd8b6e44bf1c77490b9cc1b74e029e2eb0457697d0db39e506f1e
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 0.8060

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-free-blogspot-game-hack PDF link annotation
    • http://ecotherm-01.eu/images/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ecotherm-01.eu/images/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://ecotherm-01.eu/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ecotherm-01.eu/images/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://ecotherm-01.eu/images/free-spin-coin-master-2021_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_002_off000034a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34A4 24320 bytes
SHA-256: 5be8603db729e7b1140106340d68266cbaf4b25c130c568332fdaee551d1aa9c
font_01_sfnt_off00006c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C82 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000766c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x766C 18464 bytes
SHA-256: 3d1506adb004325b5ad849f11167115e1f90dbd1428f7e6d98779d75984a0c30

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