Malicious PDF — malware analysis report

Static analysis result for SHA-256 6275556661870ff8…

MALICIOUS

PDF

34.1 KB Created: 2021-06-20 16:13:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e5905574a3d20b987f2fd83d3355a405 SHA-1: 12cbb461eb82b967e88aadc9ef553361d547b90e SHA-256: 6275556661870ff879c86fc48b171cfccd199192dff8c7bea4736cee92a3da4b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 5

  • 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.
  • 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.co/app/431946152/free-cloting-roblox-game-hack PDF link annotation
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/scpninetailedfox-mod-cheats-roblox_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/roblox-assassin_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/free-robux-no-verify-or-download_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/executor-roblox-free-no-hack-promise_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/roblox-mobile-free_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/como-conseguir-robux-gratis-en-roblox-2021-sin-hacks_GM431946152.pdfIn PDF document text
    • https://www.anders-sofa.com.tw/uploadpic/files/roblox-assassin-hack-generator_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_off00003048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3048 22028 bytes
SHA-256: 7135e890652ac13c1beb1dc3ad973e06a8b79cb2523e6b2227f19a18bc0d8ee1
font_01_sfnt_off000060e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E4 18876 bytes
SHA-256: bfefc6d536d52466a0b54a6ac3da18b3981f591a6523089314eb0a84d3e5b444

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