Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb84b588d189ea30…

MALICIOUS

PDF

36.2 KB Created: 2021-07-06 02:26:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b139b71dcc8c2b469337e7b3178c50b5 SHA-1: 2704b5af28b68707369ab4629bbb3415e9c188be SHA-256: bb84b588d189ea3072a3333650da2dd7ebf550efb08c36c0a4f869767b1b0967
142 Risk Score

Malware Insights

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

This PDF document employs a link farm strategy, presenting lures for game hacks and free currency to entice users to click through to a large number of other PDF files. The primary lure URL is http://netcdn.tw/app/406889139/100-free-spins-coin-master-2021-game-hack. The document's structure and the presence of numerous external links suggest a campaign to drive traffic to malicious or ad-filled sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/100-free-spins-coin-master-2021-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info//repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-faces-on-roblox-pc_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-no-hsck_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-99-billion_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/code-for-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/gift-card-free-online-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/pubg-uc-dark-web_GM1330123889.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-any-roblox-game-with-scripts_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-color-name-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/pokemon-brick-bronze-roblox-where-to-find-exp-share-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-ro-port-tycoon-money-cheat_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-get-free-stuff-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.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_002_off0000340e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x340E 23740 bytes
SHA-256: 411a9be2834cf313f8da54fca27266eef6a532dd9deb8a69875d4c4de22d4021
font_01_sfnt_off00006a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A11 18576 bytes
SHA-256: 92d497f8bb7a4b7cecbf731ebca98dbb8eaec3bbe78b3fd35d47c848e72ff159

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