Malicious PDF — malware analysis report

Static analysis result for SHA-256 53151073d0ef6cea…

MALICIOUS

PDF

43.6 KB Created: 2021-05-13 21:06:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5cb1bba889f507cc3d274e559d68ef42 SHA-1: 6aca16b8551dd811e37da48a866dc23d4eb07077 SHA-256: 53151073d0ef6ceaf9187680167c9928501b450ef99bafbeb914b1cf8892203e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized and related to in-game currency and hacks for popular games like Robux and Coin Master. The ML classifier and the PDF link farm heuristic strongly indicate malicious intent, likely to direct users to scam or phishing sites. No scripts were extracted, but the embedded URLs and the nature of the content suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 4

  • 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
  • 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 https://netcdn.xyz/app/431946152/earn-free-robux-today-game-hack
    • http://finettifrs.it/images/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdf
    • http://finettifrs.it/images/robux-fun-hack_GM431946152.pdf
    • http://finettifrs.it/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • http://finettifrs.it/images/free-robux-that-actually-works_GM431946152.pdf
    • http://finettifrs.it/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • http://finettifrs.it/images/mangocheats-com-hack-coin-master-cheat_GM406889139.pdf
    • http://finettifrs.it/images/coin-master-generator-free_GM406889139.pdf
    • http://finettifrs.it/images/roblox-demon_GM431946152.pdf
    • http://finettifrs.it/images/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://finettifrs.it/images/stock-speed-coin-master-free-spins_GM406889139.pdf
    • http://finettifrs.it/images/robux-hacks-2021_GM431946152.pdf
    • http://finettifrs.it/images/coin-master-free-spins-facebook_GM406889139.pdf
    • http://finettifrs.it/images/roblox-scam_GM431946152.pdf
    • http://finettifrs.it/images/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdf
    • http://finettifrs.it/images/my-roblox-account-was-hacked_GM431946152.pdf
    • http://finettifrs.it/images/roblox-free-clothes-codes_GM431946152.pdf
    • http://finettifrs.it/images/coin-master-hack-without-human-verification_GM406889139.pdf
    • http://finettifrs.it/images/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdf
    • http://finettifrs.it/images/moonactive-coin-master-free-spins_GM406889139.pdf
    • http://finettifrs.it/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdf
    • https://rblx.land
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000450c.bin
bea75fd68c99ed7dc647144be1da194944273fb18be7ced4c2c0dcf9073e3d9c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x450C 25068 bytes
font_01_sfnt_off00007d8e.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8E 2824 bytes
font_02_sfnt_off0000873c.bin
856adb635f1df42b1ab7aec7f905735c2cb2dfebd4088312a1c80dc48447787c
pdf-font-stream PDF embedded font (sfnt) at offset 0x873C 18596 bytes