Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39834c93e2cd023…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 21:40:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 514dbab2af4fc46bfbfb1775094d67d2 SHA-1: 49b502b713bd3ce43665bf05ff185ed4061d53e8 SHA-256: a39834c93e2cd02352ef248be2ff556a6e2a4a10c3943aa114817cb77ae36a89
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/free-robux-redeem-codes-game-hack. The document body and heuristics indicate a lure for free game currency or hacks, designed to trick users into visiting malicious sites. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or scam attempt.

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/431946152/free-robux-redeem-codes-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-pokeballs-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-a-free-private-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/pubg-uc-carding-quora_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/template-roblox-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox40com-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-coin-master-hack_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
font_00_sfnt_off00002e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E3E 22484 bytes
SHA-256: 255d7fde603483a5c62f6a2fff015846f8a14173465f8865b9f4c21ea5e27480
font_01_sfnt_off00006077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6077 19152 bytes
SHA-256: 2beb9c583ef49ea143b974913017cf2f00d835df8237c6c52447211218059ebd

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