Malicious PDF — malware analysis report

Static analysis result for SHA-256 566be33b708a56b5…

MALICIOUS

PDF

35.2 KB Created: 2021-07-03 17:32:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f0df5d3b44705bca9801590b6ed5e8af SHA-1: 10fdc54818cd04bc8702b7b970cd42e9a99cf47e SHA-256: 566be33b708a56b5b832461b89431479679eef97f8fc79d6c7b19379cc9f4187
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, promising game hacks and free currency to trick users into clicking malicious links. It directs users to a redirector URL that hosts a large number of SEO-optimized PDF files, likely to distribute malware or facilitate further phishing attempts. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/june-29-coin-master-hack-no-human-verification-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-no-information_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/comment-hacker-des-gens-sur-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/dank-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-generator-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/ezy-youtube-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-aockolupse-hack-mod-menu_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-superhero-tycoon-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/hack-into-someones-roblox-account_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
font_00_sfnt_off0000305d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305D 23164 bytes
SHA-256: d9f297b8c35d7fb86962b6d4c8677e571a147d9929f3915b0009a12f09d8ae8c
font_01_sfnt_off000064bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BC 18992 bytes
SHA-256: 8ce41bb01ee8b46609ea1668b003bb489b87f35bbde600b98f889cfee9b79f2a

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