Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acb67932301336f…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 22:00:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7051699aae667f4b9561426a8d5a5c53 SHA-1: a3f7f2cec44170662f2d7950160d1ced1f047c30 SHA-256: 0acb67932301336f377c8ca50ef8df17ed52f34b0c9d6db3259d48036c5d7a5e
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 0.9865

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.online/app/835599320/free-tiktok-followers-no-survey-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/pokemon-go-accounts-free-list-2021_GM1094591345.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/pokemon-go-free-game-download_GM1094591345.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-coin-master-no-human-verification_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_004_off00004ec0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EC0 24352 bytes
SHA-256: e07b3d137e0735cd7bc7ebefdc0e479e9b11ac61abc0607b99dc440aa79b4f4a
font_01_sfnt_off000086d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D7 18128 bytes
SHA-256: 4d5ae90dc7158db100f8a60f18795856627c30e44bb6186b706c2f28ceb56c30

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