Malicious PDF — malware analysis report

Static analysis result for SHA-256 6393c69b6a73961a…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 05:21:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f345da402d208cfd855ce0faa9a9b0e SHA-1: 11768575aa6667f611c0f7e24672dd9a30b50743 SHA-256: 6393c69b6a73961aafa4ca8b94bb35e002075994d6bd92958b7da02e8dd21933
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9980

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 http://netcdn.tw/app/406889139/how-to-get-free-food-on-coin-master-game-hack PDF link annotation
    • http://opac.salatiga.go.id/slims7//repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-delitive-mod-cheat-codes_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-vehicle-simulator-money-hack-download-script_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-know-if-ur-being-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/new-jailbreak-roblox-infinite-money-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/robux-generator-unlimited-hacks_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/inf-robux-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/youtube-roblox-hacks-for-rubox-com_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/best-free-roblox-tycoons_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/pubg-uc-ykleme-hile_GM1330123889.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-do-you-hack-for-cases-in-cbro-roblox_GM431946152.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_002_off000031a6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31A6 23316 bytes
SHA-256: b43dc58744724617d570b4b60f950c55320795a5c1ba1ef1aa057688c8960e53
font_01_sfnt_off00006626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6626 18336 bytes
SHA-256: 47fb12567d6486377b7920df89e23ac3319e265b72709a478f9c8a734bcf4362

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