Malicious PDF — malware analysis report

Static analysis result for SHA-256 b146f2360eb04f69…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 01:29:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5a89ed642e6ceac0c5c97b17aabe62cd SHA-1: 313017cd56ffec19bf3437d4ee61e4797184357b SHA-256: b146f2360eb04f692081b33f0d49a3398455b52aa7b7f7d67daa18dda60f04c8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on what appears to be a 'free generator / game hack'. The primary link redirects to malicious infrastructure, indicating a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment. No scripts were extracted from this sample.

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-mobile-game-hack In PDF document text
    • https://opac.itp.ac.id/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/gift-card-robux-free-2021-hack_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-to-wear-straw-hat-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/junio-2021-hack-robux-en-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/robux-online_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-admin-codes-2021_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-redeem-codes-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-obby-game_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-games-pastebin-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/best-roblox-shirt-software-for-free_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-get-boombox-free_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-just-type-in-your-username_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off000031fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31FD 22880 bytes
SHA-256: 289d6288d9c307b716c2fe854e669961ab369251b83350ed1260d9f3fb7a728a
font_01_sfnt_off00006460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6460 19104 bytes
SHA-256: 573e3addcc1a6fdc5e08f445db2ef54d6c45d37482ab709f67476411b6906f7c

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