Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9d9b4e7d30d72c…

MALICIOUS

PDF

35.1 KB Created: 2021-07-01 06:33:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b8b9cc6a8a349a62aa96806f808457b4 SHA-1: 427861cd990c11ea8b9d2202fe612ff8c7f7e729 SHA-256: ef9d9b4e7d30d72c604cee867fabf04a1f9d0e8c0ee36257b84bbdc0686d88ad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and free spins for games like Coin Master and Roblox. The primary lure appears to be a 'free generator / game hack' which leads to the malicious URL http://netcdn.co/app/406889139/coin-master-coins-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive traffic to potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/406889139/coin-master-coins-game-hack In PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/hack-piano-roblox-got-talent_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/crate-clicker-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/hack-roblox-crazzywhatever091_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/how-to-get-free-robux-on-roblox-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/how-to-get-cloths-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/how-to-hack-easy-robux-today_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/robux-get-com_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003271.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3271 23496 bytes
SHA-256: 78dc439b5591cbcaeff32160df8be6cab31a4cb134ff2a84638eb1a953bca1ad
font_01_sfnt_off000067ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67CA 17836 bytes
SHA-256: 84574f8323a35f53ec0be3b5c2b4531289117d356e64a8613214cbf4efbbad2d

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