Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8770fc61a642a2…

MALICIOUS

PDF

33.0 KB Created: 2021-06-26 08:28:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6e662223bb32659a492543ab0113f5ea SHA-1: b3c13f43b50e14af1c709e3074b35e604cf78cac SHA-256: da8770fc61a642a22abbfa9abb30654ca522b66b9a1be4eb0ce8221cbfd72901
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency ('Robux') and hacks to trick users into clicking malicious links. The document contains a large number of links, many pointing to a link farm, and at least one URL redirects to known malicious infrastructure. The primary attack pattern involves social engineering to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/why-free-robux-is-not-true-game-hack In PDF document text
    • http://perpus.ar-rum.ac.id//repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/how-do-you-get-free-robux-on-roblox-wihtout-paying_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/hacker-told-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-100-robux-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-hack-unlimited-free-robux-tickets-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-dungeon-quest-hack-script-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/good-games-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/bloxburg-us-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-secret-cheat-codes-for-music-its-raining-tacos_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_off00002a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A01 22200 bytes
SHA-256: 8bcc64c57fa2d682cd93632d9ad21e4eb170666b285da50c2574847204f1cedd
font_01_sfnt_off00005b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5B 19364 bytes
SHA-256: 23d9028332f75df14fa4eebb1b42ff85b3958ec7cd78bf74c3b5826cdf037268

Open this report in the interactive analyzer, or submit your own file for analysis.