Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff94f56a85e18e2a…

MALICIOUS

PDF

42.3 KB Created: 2021-05-19 02:07:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b470c8d82395f412234aed3bdde08a00 SHA-1: 65561a449f8cb0ebd88b4f9626b0227075704c60 SHA-256: ff94f56a85e18e2a1e619d369eeda5971ea71848a610b428078dd2cbd45b186a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are related to game hacks and free currency, indicating a scam or phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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
  • 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/1330123889/pubg-uc-sale-game-hack
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-daily_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-robux-scam_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/coin-master-free-spin-app-apk_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/coin-master-mod-apk_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/john-doe-roblox-hacker_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-game-packs-for-coin-master_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/how-do-we-get-free-robux_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/do-robux-generators-work_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-robux-gift-card-generator_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/robuxmatchcon_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/roblox-but_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-coins-and-spins-link-for-coin-master_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/coin-master-hack-download-apk_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-daily-spins-coin-master_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/free-mods-for-coin-master_GM406889139.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/easy-way-to-get-free-robux_GM431946152.pdf
    • https://elearning.man1jember.sch.id/__statics/gudangsoal/files/boku-no-roblox-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000465f.bin
3918bc23984966ea4d6c2041b98cf3888fc2420ed67900e081835972ef10ed71		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x465F 27264 bytes
font_01_sfnt_off00008322.bin
fe3c0b957c3a878cbf5467c5093089b5b458fb8b2624b74a356101e91c8145b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8322 18200 bytes

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