Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb299c34bf145fa…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 11:32:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1e695e254985b19b24aa6593f1b4614e SHA-1: d137f01b52540bc094bb36a481aa6cd72b0294aa SHA-256: bcb299c34bf145fa2468314073deef2b601f99448c8771c15edbb3278d90495e
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 0.9865

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.online/app/431946152/roblox-free-followers-game-hack PDF link annotation
    • http://oca.undil.tl/repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-become-famous-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-character-free_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/offers-for-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-400-spin-link-today_GM406889139.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_off000052a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52A2 25500 bytes
SHA-256: 16c4abcdfcae955d3f44581044e43ebef552eec8b3414cf686edacdfa3b78528
font_01_sfnt_off00008d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8D 18112 bytes
SHA-256: 09eaf6273d9322970c88a31482dbdf968207cb1ef73b55d7fd121c1bcc1f7e48

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