Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a90bab60cc050a…

MALICIOUS

PDF

41.9 KB Created: 2021-05-11 01:41:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c3f39a029a4d6af1f0c04d9abae4ca1b SHA-1: 719456494ab4ea1534a1bfa89b7b6a834071e17f SHA-256: f6a90bab60cc050a5803459774e0c946d403d770af4f535337a9320de63be95c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, directing users to a malicious URL. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be part of a social engineering attempt to trick users into clicking the link. The presence of multiple PDF-specific heuristics and the ML classifier output further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/431946152/real-roblox-game-hack In PDF document text
    • http://floreswindows.com/images/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/how-to-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/what-is-coin-master_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/hack-a-game_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://floreswindows.com/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://floreswindows.com/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/free-robux-survey_GM431946152.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_off00004936.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4936 24656 bytes
SHA-256: fa2fe3178459c730d2bc1f9cc196ab2f2af8924d7b9b4e0ccc154bb905ea8d07
font_01_sfnt_off0000821c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x821C 18012 bytes
SHA-256: fe6948f8d9aae314f4e598887823c268b1dd75a45433b0d72710ef933c851efb

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