Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26c64e7aedbb8f7…

MALICIOUS

PDF

42.0 KB Created: 2021-05-15 06:17:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6d44e4473662997d33a2c37153ea891f SHA-1: 1dccce12403ff132b92ca0898d0419d64eaf034c SHA-256: e26c64e7aedbb8f780bf1672b2bbe4c09da17c140fbfcc2c3250ce3b7e4517ee
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/406889139/coin-master-hacks-no-surveys-game-hack PDF link annotation
    • http://cmfd.nl/images/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • http://cmfd.nl/images/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://cmfd.nl/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://cmfd.nl/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://cmfd.nl/images/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://cmfd.nl/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://cmfd.nl/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://cmfd.nl/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://cmfd.nl/images/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://cmfd.nl/images/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • http://cmfd.nl/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cmfd.nl/images/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://cmfd.nl/images/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • http://cmfd.nl/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://cmfd.nl/images/jailbreak-script_GM431946152.pdfIn PDF document text
    • http://cmfd.nl/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cmfd.nl/images/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://cmfd.nl/images/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • http://cmfd.nl/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://cmfd.nl/images/coin-master-hack-software-download_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_off000048a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A5 24980 bytes
SHA-256: 9d1f213548975bb51bd3abbc44da54156b00b03cd7147f4023e365283b5478dd
font_01_sfnt_off00008226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8226 18148 bytes
SHA-256: 55a2c5e1b7f94918972dbf36de35b773a73c2c126b1f6e018f905b5ffe646750

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