Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da3160c39a01b8d…

MALICIOUS

PDF

43.4 KB Created: 2021-05-11 01:08:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 961a4a8f83d140ffc56fc9804f9e99cd SHA-1: b1693a120aa05a801e94d62fc3c9a160787f0ede SHA-256: 1da3160c39a01b8d5c5266790b69aa03fb5c4b4efcc86bede48fdfd046b2f399
142 Risk Score

Malware Insights

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

The PDF contains numerous links to websites that promise free in-game currency or hacks for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm designed to attract users searching for cheats. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a download button lure further support a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/roblox-bux-free-game-hack PDF link annotation
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/roblox-a_GM431946152.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • http://mamuhammadiyahnagahure.com/__statics/gudangsoal/files/inappropriate-roblox-games-2021_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_off00004bf0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BF0 26304 bytes
SHA-256: 3461a003795c1c17107d4cc7080900198fb1f37cda6647bbcaa3d7a678b9b239
font_01_sfnt_off0000881a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881A 18088 bytes
SHA-256: b1a1c5aa5d70c9a0c9451475d1836048e8ca34dc29aa31eabf35c019fc4d80ab

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