Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf9e9d7ac62f364…

MALICIOUS

PDF

46.0 KB Created: 2021-05-16 12:39:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 40e13356597c4a7c9096164682fbeb9f SHA-1: bac42966600ea787c258d1208b01b6d0481ac325 SHA-256: 6bf9e9d7ac62f3646587d86b1a072843a23b5c3b56b97c5199f93fa0c57645dc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary lure is for game hacks and free currency, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a malicious intent to redirect users to potentially harmful content or further phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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-free-spins-2021-game-hack PDF link annotation
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hack-unlimited-spins-apk_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-com-free_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-roblox-svg_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-free-spins-hack-but-no-surveys_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_off000048c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48C2 27876 bytes
SHA-256: c9f9522e89cb713dd686ec94f2cebe340c57af1f169bf6ec3228f694f159b23a
font_01_sfnt_off000086bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86BD 18288 bytes
SHA-256: 9f7609fba99e53c6baa99bb04d1c7e3f9b7167131c1520eb2a413cdab4a14871
font_02_sfnt_off0000a8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D7 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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