Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1ade19cff6a11a…

MALICIOUS

PDF

34.4 KB Created: 2021-07-09 03:09:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 779afaa756ae04f588628f7677ae7cb6 SHA-1: f1cd2e2e0d0e762031000d18e25ba7f7ca9a33fe SHA-256: cb1ade19cff6a11aa68b9f2d922751d979e782cde37991f80ff9be1d78e320b8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, using the promise of game hacks and free in-game items to trick users into clicking malicious links. The primary link directs to a known malicious redirector, which in turn hosts a large collection of other PDF documents, likely part of an SEO link farm to improve search engine ranking for malicious content. No scripts were extracted, but the document's structure and embedded links clearly 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.tw/app/479516143/free-modded-minecraft-server-game-hack In PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/how-to-get-a-free-dominus-in-roblox-2021-ipad_GM431946152.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/roblox-skins-free-download-fnaf_GM431946152.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/games-to-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/script-hack-roblox-legend-of-speed_GM431946152.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-robux-no-download_GM431946152.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/free-robux-disocrd-servers_GM431946152.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/roblox-free-emotes-list_GM431946152.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-pc-2021_GM431946152.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://www.elearning.mamu2bakid.sch.id/__statics/gudangsoal/files/free-modded-minecraft-server_GM479516143.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_off00003351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3351 22116 bytes
SHA-256: 4a8f41857c015352aff6f56cf148255514a89aaac5fb26c0d17d8a9b97b617d7
font_01_sfnt_off000063c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C2 18284 bytes
SHA-256: c44f5995e1a698afb30ee04b8d335bc8d1a723b5683d31903f3ca0c4c9b26917

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