Malicious PDF — malware analysis report

Static analysis result for SHA-256 751d213b0118b74b…

MALICIOUS

PDF

39.6 KB Created: 2021-05-21 15:08:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0851871b41571f93bbf5f574af29f858 SHA-1: a99e4e8e9368176de2ea6bfb76f9a2292f35cd95 SHA-256: 751d213b0118b74b00f769a20632ba8a2abb1d34a4fd593695aebf9233816f6c
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an invoice-themed lure. 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 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/479516143/free-minecraft-java-edition-codes-game-hack PDF link annotation
    • http://pythonbikers.de/images/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://pythonbikers.de/images/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://pythonbikers.de/images/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pythonbikers.de/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://pythonbikers.de/images/free-roblox-com_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_002_off000034aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34AA 25544 bytes
SHA-256: cceaf57939a2a2a421ef11cc8c245bf4665ff696b099ca4b7c037b831c7e530b
font_01_sfnt_off00006f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3F 3040 bytes
SHA-256: 88825791b477d01e298e214e5620cbb87e7de6c15ffaae46d1f1371055908c03
font_02_sfnt_off000079cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79CB 18164 bytes
SHA-256: 763f9cfe2ad76014aae7cafc6f7611f20a26af8eb80c124d2b15476bdad829f1

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