Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f5f7082780bdbe…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 05:46:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c001e997320e09bc350e674062278b53 SHA-1: 30b433e0776967980318eae62801d66634fb2bdd SHA-256: 78f5f7082780bdbe9a3dd031e89ddc9ba929f670de1837c1c5c07d0a705f19b2
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 0.9796

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/479516143/minecraft-pe-apk-free-download-game-hack PDF link annotation
    • https://opac.heritagejkt.org//repository/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/cheat-engine-roblox-hack-prison-life_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/tiktok-free-app_GM835599320.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/minecraft-pe_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://freegiftcodes.euIn 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_004_off0000544f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x544F 25500 bytes
SHA-256: 557f6d8ca10f0f660b8f1a71beffd2f28da4336443a72d28aba1597dd9c788ee
font_01_sfnt_off00008df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF7 2840 bytes
SHA-256: 20e88e247102f07c6a70b4d36c7da419714b68793fc4cb00c42292950da9c9bb
font_02_sfnt_off000097b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B4 18788 bytes
SHA-256: 56ecf13b7fdae58d5e4afb69efa7bdb7b8d9a7a0932eb3c661bed49813117ab2

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