Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e73f21fabcf738…

MALICIOUS

PDF

49.2 KB Created: 2021-06-07 10:52:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 71f5300b67e783d07a544104f8f717ce SHA-1: f47dbdbcbe25460f16d5488d33a139896b1ddfba SHA-256: 04e73f21fabcf73899b1dd8355dc35bc1bb6d2324d811ae43586a34e6166bfee
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple heuristics indicating malicious redirection and link farming, specifically targeting users with lures for game hacks and free spins. The document body and embedded URLs point to known malicious redirector infrastructure and a network of SEO-optimized PDF links, suggesting an attempt to drive traffic to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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.tw/app/431946152/roblox-phantom-forces-aimbot-free-game-hack In PDF document text
    • http://eltisstudio.sk/images/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • http://eltisstudio.sk/images/guava-juice-free-robux-promo-code_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/can-i-hack-uc-in-pubg_GM1330123889.pdfIn PDF document text
    • http://eltisstudio.sk/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/how-to-hack-roblox-and-get-free-robux-using-tampermonkey_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/roblox-lumber-tycoon-2-hack-download-for-laptop_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-2021-free-spins-link-2021_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_off00005226.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5226 26000 bytes
SHA-256: aeed60388802bf5d670c4e2f3e133efb19d4cfba5f33be770dfa5a0db6a5b37c
font_01_sfnt_off00008ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED0 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE1 18980 bytes
SHA-256: 4cb75bbb5104dc7d7fcf70788e41ec12df2b1f9d648207fbc3f977efc3e3a529

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