Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef9841b851749d9…

MALICIOUS

PDF

34.7 KB Created: 2021-06-19 17:47:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4f4a999d86c540bd611f503054503d49 SHA-1: c051551513d7d4f04f881ade57d9fb3915b3a510 SHA-256: 4ef9841b851749d9a13f2554e52c4a6b8f7923b186c7b2f87bd5f3c1f74af541
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.co/app/431946152/scp-anomaly-breach-roblox-hack-game-hack PDF link annotation
    • https://www.ergolight.at/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.ergolight.at/images/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/how-to-get-free-robux-wiki_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/free-scripts-for-roblox-studio_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/roblox-hack-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.ergolight.at/images/free-roblox-dungeon-quest-account_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/wwwrobloxcom-cheat-codes_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/seven-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.ergolight.at/images/free-robux-2021-october_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • https://www.ergolight.at/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ergolight.at/images/teach-me-how-to-hack-roblox-accounts_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_off00002f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2C 22432 bytes
SHA-256: 91a58daebcccece32124350b0498a4b27112c546403695eb9e9ae1295ed18309
font_01_sfnt_off00006174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6174 19440 bytes
SHA-256: 3809c834c4a558d049ef1c7b982f58e628d0fc5315ccaed9d28c0d98853333f7

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