Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacfb6d5a7590366…

MALICIOUS

PDF

34.1 KB Created: 2021-06-25 06:53:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3344978077d8dde12b6c6bb880da07a5 SHA-1: 1e835517194bcbb153c96830aa130411498fdb74 SHA-256: bacfb6d5a75903668628fa60d13d12857b50c50178e948ff4cb1322d89ee7c0d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free in-game currency to trick users into clicking malicious links. The document contains numerous links to external sites, including a known malicious redirector at http://netcdn.co/app/431946152/how-to-get-wall-hacks-in-roblox-game-hack, and a large number of links to other PDFs hosted on perpustakaan.unda.ac.id, likely forming a link farm for SEO manipulation or further redirection. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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.co/app/431946152/how-to-get-wall-hacks-in-roblox-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/como-ganar-robux-gratis-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-phantom-forces-free-credits_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-de-roblox-para-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-no-virus-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-do-personalized-t-shirts-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-hack-anyones-roblox-acount_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-robuxs-by-surveys_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-stuff-on-roblox-catalog-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hacking-roblox-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-link-march-2021_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_off00002ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFE 21740 bytes
SHA-256: db69ee0f0202284f1a31c4b9fc68e4bf950eda89b7695ec6dc49841b99aa2da4
font_01_sfnt_off00005faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAF 19120 bytes
SHA-256: 45ee72598c5ea5929409f5dfa26cfff9d64449bfe553d73b66e42ed8b41b9ea9

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