Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c3d180999cc9c6…

MALICIOUS

PDF

34.4 KB Created: 2021-06-26 18:03:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a615cfc927c6262b6b64bea40e590dd4 SHA-1: acc3e53b97c6f1e2ebb227a62f1c0678b39113b5 SHA-256: 31c3d180999cc9c6225335c9e4158ac093b014d8a8255a31542daf04f76a9d55
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/instante-break-block-roblox-script-hack-game-hack. This lure is presented as a game hack, suggesting a social engineering tactic to trick users into visiting malicious sites. The presence of numerous related PDF links further supports the phishing or scam nature of this document.

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.co/app/431946152/instante-break-block-roblox-script-hack-game-hack In PDF document text
    • http://library.umuslim.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-become-a-speed-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/how-you-get-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/hack-roblox-games-app_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/daily-spin_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-hack-roblox-for-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-coin-master-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
font_00_sfnt_off00003076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3076 22048 bytes
SHA-256: 305c042931176ca2318dcf43026cc562987513c6a0b3452a84c53f33ded64f2f
font_01_sfnt_off00006123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6123 19056 bytes
SHA-256: 4f3691c9bf8fbfe2d7268f9ef380ff5b7e76e12d5b2ca1e57d84714cacac5019