Malicious PDF — malware analysis report

Static analysis result for SHA-256 09eda8cd8af2df0d…

MALICIOUS

PDF

43.7 KB Created: 2021-05-16 03:30:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d338bbbbb4bfcb77822074b01a4276e6 SHA-1: cd855385ac4a0a62ec9301df635cb09e264870b7 SHA-256: 09eda8cd8af2df0dcffb6b8a96809b18cd6cee37f8e8d54f0a0d1f450c73766d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites offering "free Robux" and "game hacks", indicating a lure-based attack. The heuristic firings, particularly 'PDF_SEO_LINK_FARM' and 'PDF_GAME_HACK_REDIRECT_LURE', confirm this. The document likely serves as a phishing or scam document, directing users to potentially malicious sites for credential harvesting or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-robux-2021-no-human-verification-game-hack PDF link annotation
    • http://spstrading-th.com/images/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://spstrading-th.com/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://spstrading-th.com/images/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://spstrading-th.com/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://spstrading-th.com/images/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://spstrading-th.com/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://spstrading-th.com/images/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://spstrading-th.com/images/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://spstrading-th.com/images/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://spstrading-th.com/images/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://spstrading-th.com/images/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://spstrading-th.com/images/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://spstrading-th.com/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://spstrading-th.com/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://spstrading-th.com/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://spstrading-th.com/images/hack-coin-master-android-2021_GM406889139.pdfIn PDF document text
    • http://spstrading-th.com/images/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://spstrading-th.com/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://spstrading-th.com/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://spstrading-th.com/images/how-to-get-minecraft-coins-for-free_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_003_off00004809.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4809 27060 bytes
SHA-256: 176c155539286c7833917869fda7d196f59e6f9f7ec21a509d141c1b8d4dfe72
font_01_sfnt_off000085b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B1 19260 bytes
SHA-256: a5b009a33d06eb91b5687aca452054299973906144ac3f9b2fc2dd0e2fef1dac

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