Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6082634f79bc4a…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 10:54:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 538283987f441fdbc8e2dec62584a7ee SHA-1: 306501e632b5db2d60ca13178c18ff92d3969b4f SHA-256: 1d6082634f79bc4a4f3e0022522ad58042521f4b839cb222edeca319c58bac72
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is designed as a lure, using keywords related to game hacks and free virtual currency to entice users. It contains numerous links, including a primary redirector to 'netcdn.tw', which then leads to a farm of other PDF documents hosted on 'digilib.unbari.ac.id'. These secondary PDFs appear to be part of a link-farming or SEO manipulation scheme to promote scam sites. The document's structure and content strongly suggest a phishing or scam campaign.

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/406889139/coin-master-free-spins-blogspot-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-robux-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/admin-command-for-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-change-money-in-roblox-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-robux-free-no-download-quick-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-hack-download-prison-life_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-cheat-engine-debug-roblox-without-crash_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-2021-yt_GM431946152.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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
stream_002_off000031b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31B4 23076 bytes
SHA-256: 7467de0c621929f34999eaa5345ca9b250493c8ffe433ec0330c58b70abe2703
font_01_sfnt_off000065c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C6 18464 bytes
SHA-256: 05a87c5e5a55dd1cacb71415224dc1225f286447460dff7243b727236e2d7549

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