Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf9726b8393f4cb…

MALICIOUS

PDF

46.6 KB Created: 2021-05-11 19:43:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 28543b866f94cf74a1aa89e36fcd4341 SHA-1: 7310c61831ecddb3c3ee0ee342b05c37d24a0d91 SHA-256: 8bf9726b8393f4cb176f7155555a0e6204370a042fead885ad9990065e6c65a2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that offer game hacks and in-game currency, such as 'Coin Master' and 'Robux'. These links are identified as malicious redirectors. The document body and embedded link structures suggest a lure to external malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF's structure and heuristic firings strongly indicate a malicious redirector chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.xyz/app/406889139/8bp-hack-coin-master-game-hack In PDF document text
    • https://tena-g.hr/files/robux-premium_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-app-real_GM431946152.pdfIn 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_003_off0000496d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x496D 24456 bytes
SHA-256: eb7b3afe297461ea21238980c37fe52e58c1cc8ea2a5a5e62761f602030b0b34
font_01_sfnt_off00008172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8172 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_02_sfnt_off0000938b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x938B 18260 bytes
SHA-256: 40ee1887dd31b0862b85694c1b9e7d14e4b08e6d7c2645c8853cb2866e35e1e1