Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2bc3c595b24538…

MALICIOUS

PDF

35.4 KB Created: 2021-07-04 04:54:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ca2d93c2924c905de80207a6aae036f9 SHA-1: 65c14f5459b4a02e9905f72e5df553d2417ef8f1 SHA-256: 8d2bc3c595b2453827bf440461fddb07ac2367f59e882e2a5f752daa319d43b4
142 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a 'PDF SEO Link Farm'. The primary lure is related to 'Roblox Hack Client' and 'free generator / game hack' redirects, aiming to trick users into visiting malicious URLs. The ML classifier also strongly indicated maliciousness.

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/431946152/roblox-hack-client-game-hack PDF link annotation
    • https://www.bodyammo.in/uploaded_files/userfiles/files/free-ss-executor-roblox_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/how-to-get-free-money-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/free-robux-live_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/playing-games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/how-to-make-your-own-dominus-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/apocalypse-rising-roblox-map-free-download_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/free-roblox-accounts-with-bc-2021_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/how-to-run-faster-in-roblox-hack-murder-mystery_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/nisterv-free-robux-hack-youtube_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/roblox-how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.bodyammo.in/uploaded_files/userfiles/files/roblox-free-glasses_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
font_00_sfnt_off0000324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324A 23108 bytes
SHA-256: cc93f4ab23bc55079d8fefb15ffbd1e93a98b0db20b341249f29e1fde7f58b10
font_01_sfnt_off000065e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E5 18880 bytes
SHA-256: aff42d3783a335d76f19585087556b5fc01da002b55490b257e48f03a6311b61

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