Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecdf9ae3feb107c…

MALICIOUS

PDF

45.7 KB Created: 2021-05-20 02:12:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 794e6cfb6bea06bbe6ad6cdb94390087 SHA-1: d6b4ef939a03883d4e13d11d44c51237c27ff045 SHA-256: 4ecdf9ae3feb107cf0d36b6445005a7dd28c970f1e98ed80a249bd36d935d581
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 0.9984

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/free-robux-hack-game-hack PDF link annotation
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/whats-robux_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000490c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x490C 32824 bytes
SHA-256: fb502e0021253cadd0c316ff31a3828f041e11c2ad9394c9cc062b979c938bd7
font_01_sfnt_off00009037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9037 18412 bytes
SHA-256: 8090616d8a5c0701bec53dfbbcc7430816d9db69864bd7c9067c717eb12c26b4

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