Malicious PDF — malware analysis report

Static analysis result for SHA-256 8793fe0a1608823a…

MALICIOUS

PDF

42.9 KB Created: 2021-05-11 17:32:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ecfca98bc08e50bfeff549aeb14b6da2 SHA-1: 3ca3680f0f2f92d3da941b687d325b11f32692c0 SHA-256: 8793fe0a1608823a963d8c8871ad2a776b6cc1a62dc2e6e9dba6773004573bbb
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, including one to a 'free generator / game hack' lure, and is flagged as a link farm. The document body and heuristics indicate a social engineering attack designed to trick users into clicking malicious links, likely for game-related cheats or currency. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/minecraft-hacks-pc-game-hack PDF link annotation
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/freespins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-free-master_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/unlimited-spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/www-robux-com_GM431946152.pdfIn PDF document text
    • https://www.charnwood.staffs.sch.uk/admin/ckfinder/userfiles/files/free-gold-cards-coin-master_GM406889139.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_off00004e57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E57 25004 bytes
SHA-256: ddbeeeba69ba7c5b5b92230ff0cf4b6cfd1d909a1d086e031639aeba1260de43
font_01_sfnt_off000086b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B0 17892 bytes
SHA-256: 4b573e8fc82ea506cc897612561133da94e30df5f60715d4b9731bc7aae59dad

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