Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05c69ec77b8239d…

MALICIOUS

PDF

44.1 KB Created: 2021-05-16 11:04:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a3bea0de160e5d32290081d0a4abff8e SHA-1: 6811de96c86f8c5cf2260e15c2ae083e8aee72f8 SHA-256: b05c69ec77b8239d1f50db0f9417026625b1961022ae90e88ad8c61ed3a11a91
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/robux-without-verification-game-hack PDF link annotation
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/roblox-games-free_GM431946152.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/robux-sign_GM431946152.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://e-learning.man3kabcirebon.sch.id/__statics/gudangsoal/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d9d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D9D 26008 bytes
SHA-256: a4292f2959630f1f9f0df1a1ec45da632b05aa88903b90b44eaacb4e88e6bdaf
font_01_sfnt_off00008868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8868 18800 bytes
SHA-256: 8dd03be5ed9b12d1c3526750c50f565b8632fbaca0af0073180c26b06898ff47

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