Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b962eb7ec696ae…

MALICIOUS

PDF

46.4 KB Created: 2021-05-15 04:13:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d211740b05b5771d6ecaf3ef54e2371e SHA-1: f377d51842680a5152c390ec4ed4b4f5fda662b6 SHA-256: 43b962eb7ec696ae069da0ebc9e5d4a3a2595e9205f3c62317213a03f15492d1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple external links, including one directly advertising a 'coin master daily free spins' hack, and a large farm of other PDF links. This suggests a lure-based attack pattern aimed at driving traffic to SEO-optimized content or potentially malicious sites. The presence of a 'visual download button' heuristic further supports the idea of a deceptive user interaction.

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/406889139/coin-master-daily-free-spins-25-game-hack PDF link annotation
    • https://foc.vn/public/upload/files/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/minecraft-items_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/robux-prices_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-gameplay_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_off00004c1b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C1B 26548 bytes
SHA-256: 99dd3f1aea78ad18b06951ec3e30a03523f8a23edd22491763a4409a102af072
font_01_sfnt_off000087eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EB 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000091d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D5 18568 bytes
SHA-256: b4b281bb5b6dfe092bf3b90adf491610ab408f1d3fe0f6ae1605b441ac4007a5

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