Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebcec1fc53fc047…

MALICIOUS

PDF

44.5 KB Created: 2021-05-19 16:24:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f33a9d45ebc3c9ef3d7838723d98ca03 SHA-1: 316e2c58110a2b44d995e3b921246f6bf63da4ee SHA-256: 0ebcec1fc53fc047d013ab7175accdb3ce71e1c6be5b332c38ce2b97395c5408
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are SEO-optimized to appear as game hack generators or free currency sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to drive traffic to potentially harmful sites. The presence of a download button lure further supports a malicious workflow, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/no-human-verification-coin-master-hack-game-hack PDF link annotation
    • http://adues.org/images/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://adues.org/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://adues.org/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://adues.org/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://adues.org/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://adues.org/images/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://adues.org/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://adues.org/images/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://adues.org/images/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://adues.org/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://adues.org/images/wurst-115-2_GM479516143.pdfIn PDF document text
    • http://adues.org/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://adues.org/images/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://adues.org/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://adues.org/images/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://adues.org/images/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • http://adues.org/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://adues.org/images/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://adues.org/images/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://adues.org/images/how-to-get-free-robux-not-a-scam_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_off00004878.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4878 25092 bytes
SHA-256: c567ad8f993fe0444e985745e24a551a4a9872dd8b1e2837390055aeede83bfe
font_01_sfnt_off00008195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8195 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7F 18248 bytes
SHA-256: 2e1975aa3922e5ccf046fc1318918433c9a3e44b25ecb6dda2fd98b61a709aed

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