Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d46ccd73188400…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 22:44:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 49df4fcad966da83d1d73f3b0e5d2529 SHA-1: cae9d521e31d443771e04024ee34581038674306 SHA-256: 53d46ccd73188400215eceda361b900568bf621eb79e52ed8bc504117cd91a75
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/406889139/coin-master-free-daily-spins-today-game-hack PDF link annotation
    • http://oca.undil.tl/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/get-robux-now_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-minecraft-bedrock-server-hosting_GM479516143.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_004_off00004e0d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E0D 25160 bytes
SHA-256: b500ff4d4a3bf25e097cd4a83b948402e1fe0df1e3c84b4bf8d322a03a944ab3
font_01_sfnt_off000087b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B5 18480 bytes
SHA-256: 3f20608b23d642d48b0ef55ae4729c727d7cf00d09df157ae026893392480c2b

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