Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a703ab44d2c18f1…

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 00:29:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2cf6abb6406443f42d7f47c2bef11be5 SHA-1: 396958590e1bad10ef997fdab9b7d620e6284f54 SHA-256: 3a703ab44d2c18f14b593bdf666a06c058a48cc0db1f95cb1ac3aa7a6201076f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9980

Heuristics 4

  • 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/431946152/hey-google-how-do-you-get-free-robux-game-hack PDF link annotation
    • http://www.myresidence.lu/userfiles/files/robux-hack-validation-code_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/cheat-da-hood-roblox_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/working-hacks-for-getting-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-exoliner-free_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/roblox-hack-2021-for-all-games_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-gift-cards-reddit_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/how-to-get-a-free-vip-server-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/free-robux-getter_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/purchase-iteam-free-pastebin-roblox_GM431946152.pdfIn PDF document text
    • http://www.myresidence.lu/userfiles/files/robux-free-page_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_off00003073.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3073 23016 bytes
SHA-256: 27c6fa1050a2a6cdb1ad061d84caae0071bbbd273147884928b2d3a1e1b88ba5
font_01_sfnt_off0000645b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645B 19568 bytes
SHA-256: c947cb9e4153dfb2ea198cd701ec4d5f338e29feb7802fd2debd87897cec7901

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