Malicious PDF — malware analysis report

Static analysis result for SHA-256 438ec2e97e9cfa93…

MALICIOUS

PDF

35.8 KB Created: 2021-06-19 08:16:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 98b3cc2cc941e4deffa5b39202d3c726 SHA-1: 9220fc498edeeb699eff030923e23d04ee38e555 SHA-256: 438ec2e97e9cfa9382022ced13b2e9cc3010b6b69f9ee204ae8ef322b9653ebe
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appear to be game hacks or free currency generators. One primary URL, http://netcdn.co/app/431946152/how-to-get-free-robux-without-survey-and-verification-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a mass link farm strategy, likely to distribute malware or facilitate phishing.

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-free-robux-without-survey-and-verification-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/free-apps-like-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-item-in-catalog-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-money-cheat-download_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/new-roblox-hack-exploit-for-murder-mystery-2_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hwo-to-get-free-robux-with-out-password-or-hacking_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off000032ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32CE 22160 bytes
SHA-256: e12fbb6ec38fdcc839ab5c801a7d5898c212be993f299147cd31ad5326511d9d
font_01_sfnt_off000063e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E9 20068 bytes
SHA-256: f3c74f7357f361f124fa4688d0efe90469100e5cffb381759649813a8782abaa

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