Malicious PDF — malware analysis report

Static analysis result for SHA-256 619ad3dcd8cfd388…

MALICIOUS

PDF

43.6 KB Created: 2021-05-12 04:30:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c178d629d9d3ac7f0e003e620701fa53 SHA-1: 0c2ef262fa4c0a3ef22af5c83ef3a4c1b448c7bc SHA-256: 619ad3dcd8cfd38814b5ff3eb48d47e65e11f8c50b397a9920d2b930f5fc0278
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/406889139/free-spins-coin-master-links-blogspot-game-hack PDF link annotation
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/robux-generator_GM431946152.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • http://elearning.min11blitar.sch.id/__statics/gudangsoal/files/roblox-hack-download_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_off00004f3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F3B 24892 bytes
SHA-256: 89a58bd217d3d59114c57e993116561a892eb0f750b590502e27574d6efe7ffa
font_01_sfnt_off00008743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8743 18632 bytes
SHA-256: e19cb03e4db5dc0ff2825ab1b6cd29120edbbac4e5fd870bab1836bcb421f615

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