Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c504088d82dffbf…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 06:02:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 38285f087219166abf69f5e006117643 SHA-1: b5cd67ca69bfe6a196ddf4d8ae6194fb774471f9 SHA-256: 4c504088d82dffbf193b7d42f3cf6983a2cd31a4e5de1ee00cbaceb688da41db
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to redirectors and link farms, masquerading as generators for free game currency like Robux and Coin Master spins. The primary URL, http://netcdn.tw/app/431946152/free-robux-come-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt designed to lead users to potentially malicious websites.

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/431946152/free-robux-come-game-hack In PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/hack-and-receive-your-free-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/roblox-free-fashion-frenzy_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-website-legit_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/fake-gps-for-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.semrush.com/prices/In 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_off00002f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F49 23232 bytes
SHA-256: 0f00fb3301a57dc2842e273bb70ff2aa2a33ce746251954b1b7cd63e7fa0ad13
font_01_sfnt_off00006371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6371 18976 bytes
SHA-256: 20782bd0acfe52469dc9f14a315b4aee1c9563688044d1d6d3a516ef71528a8c

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