Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d00b6f331fb144…

MALICIOUS

PDF

44.5 KB Created: 2021-06-11 02:50:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6cb24c6f292343b53ccdfd483642f2f7 SHA-1: 1e5067ac71ade354a9fdc2165dace7d06bed4eb0 SHA-256: 52d00b6f331fb14402384c75e0cb1f5dff2ab776817526a6f960bbdcf45c1580
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of free game hacks and Robux to entice users to click on a malicious redirector URL. The document also contains a large number of SEO-optimized PDF links, suggesting a link farm designed to drive traffic to potentially malicious sites. No scripts were extracted, but the presence of malicious redirectors and the lure indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/free-robux-generaters-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/tiktok-free-app-download_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-hack-no-human-verification_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
stream_004_off00005078.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5078 25236 bytes
SHA-256: 382495ec70eee313e3ec2b8322dd0df937da2170b73790a50bd9a6a4e9992a6b
font_01_sfnt_off00008b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B26 18344 bytes
SHA-256: c65978df608d12e4662773111b595639a7113445a000c367557116035fe0caa4

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