Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6e34a069ef3e43…

MALICIOUS

PDF

45.4 KB Created: 2021-05-11 06:47:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5a4477155d19de7ecbb6c949764d9eb8 SHA-1: 2117f1ab124c0b775cd8f013ac8182351d1dbe50 SHA-256: af6e34a069ef3e43dd598fe7879576a66939bebccfb7b64d6bec10a39e6445ec
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a 'link farm' by heuristics, directing users to websites offering game hacks and free rewards. The primary lure appears to be related to 'Coin Master' and 'Robux', common targets for social engineering. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of it leading to a malicious site or further download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/do-coin-master-hacks-work-game-hack PDF link annotation
    • https://laconce.com/images/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://laconce.com/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://laconce.com/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://laconce.com/images/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://laconce.com/images/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • https://laconce.com/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://laconce.com/images/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • https://laconce.com/images/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • https://laconce.com/images/roblox-rewards_GM431946152.pdfIn PDF document text
    • https://laconce.com/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://laconce.com/images/free-coin-master-s_GM406889139.pdfIn PDF document text
    • https://laconce.com/images/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • https://laconce.com/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://laconce.com/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://laconce.com/images/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • https://laconce.com/images/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://laconce.com/images/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://laconce.com/images/robux-win_GM431946152.pdfIn PDF document text
    • https://laconce.com/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://laconce.com/images/free-robux-offers_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_off00004bdd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BDD 25536 bytes
SHA-256: 6f0c603b42bd7af6d6a1c9468910035ef2e26b3a7f65163826b4fae4caa70847
font_01_sfnt_off0000856b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x856B 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F55 18084 bytes
SHA-256: f8c78c837c510fd4c2649389405ccb72ed9929e6c9684da8546624ee5ed0ed92

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