Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff3750c49cd97ce…

MALICIOUS

PDF

54.5 KB Created: 2021-06-03 22:03:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ce34d1f01687f9292ac79d801b2349f6 SHA-1: 4d4786eb07f78d51e9159d72213ddbe61604a7aa SHA-256: 9ff3750c49cd97ce6a953f88c61eb7fbda5315139dd4b588d89da602f5d3101f
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple external links, including one that leads to a 'free generator / game hack' lure. It also displays a fake CAPTCHA or human verification prompt to trick users into interacting with the content. The primary URL identified is https://netcdn.online/app/431946152/how-to-get-free-robux-without-human-verification-game-hack, which is likely used to deliver a malicious payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9387

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/how-to-get-free-robux-without-human-verification-game-hack PDF link annotation
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/daily-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-without-verification_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005457.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5457 28844 bytes
SHA-256: 6f108e8ee336ca009c5947a1e4705a64e7a795bcd70e25cbc09c4711afc8a8e9
font_01_sfnt_off0000956a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x956A 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00009f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F05 6768 bytes
SHA-256: fa93de321190668b294ff46149e4b98ac349b4fd022dcee9ecd964f7f59f3f9a
font_03_sfnt_off0000af44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF44 19388 bytes
SHA-256: c7994a70f951e7a274445218605a0e5dad46067da7d3a89c75279f94e76bcfde