Malicious PDF — malware analysis report

Static analysis result for SHA-256 475bfe567ad419e5…

MALICIOUS

PDF

45.8 KB Created: 2021-05-18 02:32:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bcb14a90d0ecd51664bf57fc79235046 SHA-1: 0254136f6d0abd44dcd220eab8d7b139e3def14b SHA-256: 475bfe567ad419e57438476d22172d2a46977142b97abfa4b705712fbc57b228
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 0.9432

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/431946152/rbx-hut-promo-codes-game-hack PDF link annotation
    • http://salantiskis.lt/images/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://salantiskis.lt/images/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://salantiskis.lt/images/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://salantiskis.lt/images/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://salantiskis.lt/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://salantiskis.lt/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://salantiskis.lt/images/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • https://collectrobux.coIn 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_off000047cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47CD 25692 bytes
SHA-256: c79dc13164665344f1feca445c12d9fbdc4434f38496627320f3c4533f410e76
font_01_sfnt_off000082a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A6 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00008fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB7 18544 bytes
SHA-256: 3932e00da52bee9380420d38fb2034f39e9e0515dfd29b0dacfc54573cc91d35

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