Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b429cc4e255365b…

MALICIOUS

PDF

44.6 KB Created: 2021-05-11 17:00:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 23d8324c06f76dc554abcb45bd844d7f SHA-1: ff86216fbcd5ade9d6cd8ceee975f7c7f9dd6841 SHA-256: 7b429cc4e255365b4a8c22fa580df8bebbf858398f219313c7ce43dc74bfbd20
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed as a link farm, with lures related to game hacks and free currency. The primary URL, https://netcdn.xyz/app/406889139/spin-and-coin-link-game-hack, is a clear indicator of a scam or phishing attempt. The document body, though partially corrupted, contains embedded URLs that reinforce this pattern. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 5

  • 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.
  • 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/spin-and-coin-link-game-hack PDF link annotation
    • http://baah.ca/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://baah.ca/images/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • http://baah.ca/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/coin-master-free-link-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_003_off00004b56.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B56 24664 bytes
SHA-256: 4ed41789111923ab7cef0daa6d5205f48eb37b5f8e9fac7a2284ec314643d932
font_01_sfnt_off000083da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83DA 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8B 17736 bytes
SHA-256: 712bfdfe30982b1ff8f7dea34df7c3666928d55570c192a0b250fd08dd003b23

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