Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf04dfcdf05e571…

MALICIOUS

PDF

50.0 KB Created: 2021-06-03 22:49:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 819801a7fd274ae367538e6ae963439e SHA-1: 2f08cd17eba8212cf0b7f8805079068aab781101 SHA-256: 1bf04dfcdf05e5716b41457aabfa53ef0fc478fb0a9382534b8f5c745a57f7e7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are designed to appear as game hack or cheat download pages. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to drive traffic to potentially harmful sites. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/431946152/roblox-hack-scripts-pastebin-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/pokemon-go-free-gift_GM1094591345.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/why-pubg-uc-is-expensive_GM1330123889.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/cheats-coin-master-free-spins-and-news_GM406889139.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_004_off000051bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51BD 29548 bytes
SHA-256: 759181794d82ec7990cb0f9e531de28025144f15a511b8993ba5953f2980cc35
font_01_sfnt_off000095ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95EA 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9D 18736 bytes
SHA-256: ab18ebd86474bf723d827c8d503b9efdd759369ebb4bbf8c3e0b4762acc2a078

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