Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c970bf3627ab061…

MALICIOUS

PDF

42.2 KB Created: 2021-05-17 21:45:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7ba20ff71d9a21e1d0f37bc617173a62 SHA-1: a9e80322324f0e9b6602e70cfb0fd933829fa2de SHA-256: 4c970bf3627ab06164f2a68cc14977bb81e26bd45ced0b0c22bc034b7c7d1a6c
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 0.9971

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-com-free-robux-game-hack PDF link annotation
    • http://ekaterinakorneva.com/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/worst-client_GM479516143.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://ekaterinakorneva.com/images/coin-master-hacks-for-spins_GM406889139.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_off0000476e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x476E 25444 bytes
SHA-256: abed6e51f6a14dcf8c885a1269462e7a5fdc1b351374764cb427d776d4b4c22d
font_01_sfnt_off000082bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82BC 18276 bytes
SHA-256: 15a0db03ecad41b32ad15729058012b5ee1d917146ec7af3e780186d41394abc

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