Malicious PDF — malware analysis report

Static analysis result for SHA-256 026184bcbb96865d…

MALICIOUS

PDF

48.2 KB Created: 2021-06-07 11:21:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 832051a1ebfe7afea4a55f013431fee6 SHA-1: c57fad34ce363e3634285d8b13dee2981c9ac292 SHA-256: 026184bcbb96865db4093b324200c399cc7abeb926fb5e1c3655b95c884afbf5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising free game-related items like 'Robux' and 'game hacks'. The primary lure URL, https://netcdn.tw/app/431946152/code-for-free-red-jacket-roblox-game-hack, is flagged as a malicious redirector. The document body, though partially corrupted, contains similar lures and embedded URLs, reinforcing the phishing and redirection attempt. No scripts were extracted, but the presence of multiple malicious links indicates a high likelihood of leading users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • 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.
  • 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 https://netcdn.tw/app/431946152/code-for-free-red-jacket-roblox-game-hack In PDF document text
    • http://krumerhaus.at/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-free-download_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-hack-on-roblox-huawei-tablet_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://krumerhaus.at/images/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-website_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/krnl-download_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e90.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E90 26324 bytes
SHA-256: b3cd39e1e3ecf5c16b825500de7bf6567716a75265e82f496fb6371058d43e6d
font_01_sfnt_off00008b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7F 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9826 18792 bytes
SHA-256: 62cfa99489bd7ed1aaff03f7c26c119f7f09718a27a7484412d013b94f5f61a5

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