Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a791329d215d2d…

MALICIOUS

PDF

46.6 KB Created: 2021-05-15 02:49:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0767d95e2725537c7b0ca945c22c23ed SHA-1: 1608c0b3b2827d7d888c260960949adb757889a5 SHA-256: c5a791329d215d2d4d7caac0a8a53bad42e217631fbdb06be567b72ff3793000
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 0.8948

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/roblox-script-hacks-game-hack PDF link annotation
    • https://miraller.com/upload/files/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-download_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/wurst-client_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/links-to-get-free-spins-on-coin-master_GM406889139.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_off00004b49.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B49 25356 bytes
SHA-256: 42315dc47c59fc25ed5dd6fe7a536b2ee6d18fa24b2e18c86fc83f83a58d64d2
font_01_sfnt_off00008614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8614 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000092bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92BC 18580 bytes
SHA-256: 535ec4be0d2657e9981f9200dcc4c4c41f6589372ce54f218017d5d6a2e1f0f5

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