Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa9c54126f149c7…

MALICIOUS

PDF

46.9 KB Created: 2021-05-17 08:02:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 217d4f4b6856428d9c1b67c83700dc0a SHA-1: 431697b22d47731e18a65d773902d0c0684f7c29 SHA-256: 4aa9c54126f149c782426386394c22b2dc99978d0dcb53c24a6143742048a3ec
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 0.9073

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/free-coin-master-spin-app-game-hack PDF link annotation
    • http://mountain.mn/uploads/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-live_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-exchange-40-free-spins_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004896.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4896 29848 bytes
SHA-256: eaa5d8efe837860a654142f560d77937a2dd8560388fcc70fd0fc9c5c7e08c7a
font_01_sfnt_off00008c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1E 2944 bytes
SHA-256: fcfcd28869b8d6c7503d63ed8d48371ec5b580fea2733193e2acbb82b3d30a76
font_02_sfnt_off00009648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9648 17884 bytes
SHA-256: 6a5fc0e5ee3990f98fff047e5d02c1443490e61ce795861dff478bab25fb071a

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