Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a61db1051cb2f4…

MALICIOUS

PDF

45.3 KB Created: 2021-05-15 01:41:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 88bb6b8a5696d149952d1a00e25b274b SHA-1: 13aa8586200e431689ec38e70a76112244ee07a4 SHA-256: 04a61db1051cb2f4b083eedb8234f30c49a1c33dbd395415d141ecc4b147c4e3
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 0.9551

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 https://netcdn.xyz/app/406889139/kachifpro-game-hack PDF link annotation
    • https://www.roltechnik.hu/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.roltechnik.hu/images/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.roltechnik.hu/images/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://www.roltechnik.hu/images/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://www.roltechnik.hu/images/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://www.roltechnik.hu/images/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • https://www.roltechnik.hu/images/cheats-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.roltechnik.hu/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.roltechnik.hu/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.roltechnik.hu/images/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://www.roltechnik.hu/images/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://www.roltechnik.hu/images/blox-best-robux_GM431946152.pdfIn PDF document text
    • https://www.roltechnik.hu/images/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.roltechnik.hu/images/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://www.roltechnik.hu/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.roltechnik.hu/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.roltechnik.hu/images/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://www.roltechnik.hu/images/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • https://www.roltechnik.hu/images/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • https://www.roltechnik.hu/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BEE 25272 bytes
SHA-256: ccc24d783421c93bc456970cbe7250a5f0d2181fe6edf3c5f7f7863361932b66
font_01_sfnt_off0000865a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x865A 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000900c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x900C 17784 bytes
SHA-256: f5f16e9fe06415f99f9f196ec79e922628d3dac9c37f6a7894d79eeb781dffd0

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