Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff860735e5cfa26…

MALICIOUS

PDF

34.2 KB Created: 2021-06-27 00:39:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e950f7029117e911ab168bb7bd295c29 SHA-1: 9f77637078e353ee3c0cecafff7abc2f0b7c83ff SHA-256: eff860735e5cfa26ed6c19dd12e89e5b4997e7366137de90045deff43436c0ef
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/obby-that-gives-you-free-robux-game-hack PDF link annotation
    • http://sttlets.education/senayan/repository/pokemon-go-free-apk-download_GM1094591345.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-lumber-tycoon-hack-money_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-roblox-accounts-girl_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/pro-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-hack-free-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/free-800-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/auto-clicker-hack-roblox-download_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-prison-life-hack-202_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/is-it-possible-to-get-free-tiktok-followers_GM835599320.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_off00002e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E30 22048 bytes
SHA-256: 89b236006d767bd7592bbe2137fa37517a6ba920c3b0bc5db8bf2135865ce69c
font_01_sfnt_off00005ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF9 19564 bytes
SHA-256: ebbdcff3bc5a5d50152a266a4d166ffd9c5c1432b87a4e0f375162583706fa92

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