Malicious PDF — malware analysis report

Static analysis result for SHA-256 2166fc0bc3090b5d…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 11:56:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 906a1ecaee1189d159f9dad334eb2351 SHA-1: a6c6d48c2214db4dbd0e1e0887b1d53d13b4c62d SHA-256: 2166fc0bc3090b5d61ee58bb6f6c695c49b62fc4613a19c3b64d19a87614be71
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The ML classifier strongly flagged this PDF as malicious. The presence of these links and the lure content indicates an attempt to trick users into visiting 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.tw/app/406889139/free-coins-coin-master-link-game-hack In PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robux-adder_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/best-hacked-client_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/can-you-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/cheat-files-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robux-hack-give-250k_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-working-roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-online-generator_GM406889139.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_002_off000030b9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30B9 23080 bytes
SHA-256: 745060962758c448b0719b5646504cf6130ee6a04fb206b261e154f029592d96
font_01_sfnt_off00006470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6470 18168 bytes
SHA-256: b0fd03f2280421e1c8ba538a35ec3a9afcfe64ddb22ef6ef66156561f264a38b

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