Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f5ed81e1e7de47…

MALICIOUS

PDF

45.9 KB Created: 2021-05-16 15:05:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4e47d821be4f467240240e2ba4faa4a4 SHA-1: 6f179afe11ee48d1c37c5ad139a96ed980cc277e SHA-256: 98f5ed81e1e7de470d237e994bb0ec1d9195e948c81b2ae541b7f9e8aba1261a
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a seed-phrase/secret-recovery lure. 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 0.9432

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/june-29-coin-master-hack-no-human-verification-game-hack PDF link annotation
    • http://maestriadental.com/images/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://maestriadental.com/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://maestriadental.com/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/i-need-robux_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B20 26336 bytes
SHA-256: 73d23ca3caac2bb594a208670fe9fc417846c73b1f3aa726c76cb2867bb64390
font_01_sfnt_off0000857d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x857D 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00008f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F62 18704 bytes
SHA-256: ad2bbd3131f8bee0b8f81db1f1c55f183910266b6691054624cf4eb89d04d61e

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