Malicious PDF — malware analysis report

Static analysis result for SHA-256 784abe5820ae1198…

MALICIOUS

PDF

43.9 KB Created: 2021-05-17 02:54:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: eef789daf8541ce2e99195501b32a031 SHA-1: a3ad0a148a939b2cc5891c6d0b168549aa9df916 SHA-256: 784abe5820ae119806a88ab6b40e46458194fc32c03f2c55c341eeaf9bff5952
220 Risk Score

Malware Insights

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

This PDF document employs a lure for free Robux and game hacks, containing multiple links to redirector infrastructure. The primary redirector URL, https://netcdn.xyz/app/431946152/rbx-free-robux-game-hack, is associated with malicious activity. The document also hosts a link farm of 28 PDF files, suggesting a broader campaign to distribute malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the presence of malicious links and redirectors indicates a high likelihood of further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/rbx-free-robux-game-hack In PDF document text
    • http://apx-centre.ru/images/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-coin_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-hack-roblox-games_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_003_off00004c6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C6D 26132 bytes
SHA-256: 442859559babc54eaad7262e6dcd64e89475ff78262cebf2611eed7be838eb39
font_01_sfnt_off00008a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A50 18012 bytes
SHA-256: 03f7603bc8a5695bbd0c39958af3fcfd5a932cbc13eba7563a8e8ca8b5ca4208

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