Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1c671432975290…

MALICIOUS

PDF

33.2 KB Created: 2021-07-04 18:17:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 23bfde1640744940f16492e707c17aa3 SHA-1: cdfe5d3dbc290f7abc5f8a9cca9be50eefc3b044 SHA-256: 5a1c6714329752909fd14d6a4b38f536d4f644abdb6e8b0bb559ebde9fa028bb
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, including a critical redirector at http://netcdn.tw/app/431946152/free-robux-accounts-game-hack, and also functions as an SEO link farm. The document body and heuristics indicate a lure for free game currency (Robux) and hacks, often a pretext for malware delivery or phishing. The presence of a 'password-protected archive' lure suggests the document may be intended to trick users into downloading a password-protected malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-accounts-game-hack In PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-robux-by-playing-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-vip-in-a-roblox-game_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/who-to-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-hacker-cods-fr-redline_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-use-cheat-engine-62-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-hack-restuarant-tycoon-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-fort-bragg-hack_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/hack-roblox-robux-apk_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-hack-download-code-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/hack-and-get-a-roblox-account-banned_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-roblox-script-hub_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/unkown-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-hack-free-roblox-with-kali-linux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-hack-roblox-accounts-without-passwords_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-hacks-robux-december-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/i-just-got-free-robux_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_off00002b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B2F 22728 bytes
SHA-256: a8161c776889f25b9de92ec2323c7ecdebfa2e220077ea54a29999ac02aca1f3
font_01_sfnt_off00005dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCB 18820 bytes
SHA-256: 9247447a3c3765c463ad34d06656dabe45291e7d100ded84caf3f858f3985503

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