Malicious PDF — malware analysis report

Static analysis result for SHA-256 4236873cd9cd17e0…

MALICIOUS

PDF

35.6 KB Created: 2021-06-20 13:33:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7135666a1bc74600b3800cc9343cf8d7 SHA-1: a2518f17579dcf5ae5bd997075a28eee76999e65 SHA-256: 4236873cd9cd17e09aae2fcaa436a608e25ece412a9d05547fca96d5341dd4c5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and SEO link farms, disguised as 'free generators' or 'game hacks' for popular games like Roblox. The document body and heuristics indicate a lure to download or visit these sites, which likely serve as a gateway to further malicious content or scams. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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.co/app/431946152/roblox-free-copy-place-service-game-hack In PDF document text
    • https://www.toyogas.com.tw/upload/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-aesthetic-clothes-roblox_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-coin-master-s_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/is-tiktok-free-to-download_GM835599320.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/roblox-lua-scripting-book-free_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-to-get-free-robux-on-chromebook_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_off000033e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33E8 22292 bytes
SHA-256: 2d7a706085f5e1678892df87e4c933a4355c69a44719c63a83fd7d9b25e06883
font_01_sfnt_off00006570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 19392 bytes
SHA-256: 6432e5147c4a17a16b2df22919dbcf62e004d0b31f7178da836ee2fa0ace5205

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