Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7fd3221bf1651c…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 09:33:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 46971aa6d3ac28d92c1308d40d34330a SHA-1: 60aff260c2a6edc8be0405d49cc4feab7d278de0 SHA-256: ed7fd3221bf1651cec04d308a1bbdb06add2a2676dd061101969ee6daecec319
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links designed to trick users into visiting malicious websites, masquerading as 'free Robux' generators or game hacks. One critical heuristic identified a link to known malicious redirector infrastructure, and another noted a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.tw/app/431946152/free-robux-no-generator-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/granny-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-bc-claims-and-generators_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-the-new-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/good-robux-hacks_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-robux-on-roblox-no-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-mod-apk-unlimited-robux-2021-download-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-anti-afk-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/unpatchable-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-sprinting-simulator-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-glitch_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
font_00_sfnt_off00002f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F8C 21824 bytes
SHA-256: 18d45b527154efe214eb3a4ca83cfdcde4ddc522797aaf0195c380940e10a236
font_01_sfnt_off00005faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAA 18820 bytes
SHA-256: 261ea0d489a423ac242e977cf9c2ebb558fc055835ac2ff71b731d45313ea59b

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