Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc244cc2d8ca7801…

MALICIOUS

PDF

43.1 KB Created: 2021-05-16 05:04:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a2395615979af81aae2bb0f9aa58e8fe SHA-1: 8ff09ffca92754a652c21081faeedcba0c446723 SHA-256: bc244cc2d8ca7801d9962f7d777d471465538d3b2d65a854f4b17c952a95a0b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, with one prominent URL identified as a malicious redirector. This suggests the document is designed to trick users into visiting potentially harmful websites, likely for phishing or to download further malware. The presence of a download button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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.xyz/app/406889139/coin-master-15-free-spin-link-of-last-5-days-game-hack In PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/static-moonactive-net_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/add-robux_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-www-com_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/robux-prices_GM431946152.pdfIn PDF document text
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-spin-coin-master-2021-link_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_off00004ad1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD1 25944 bytes
SHA-256: fee7eee854edef43970e0a700e602ea26b7ee4df2957b55e4fab6e6fa71525ec
font_01_sfnt_off00008504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8504 18644 bytes
SHA-256: 4144dbe1534d0325d37e4c6129895ddb34a2bc26123e242025982d4ceef1bd2b

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