Malicious PDF — malware analysis report

Static analysis result for SHA-256 8965757a6d4d3dc4…

MALICIOUS

PDF

59.9 KB Created: 2021-05-16 11:03:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4917bfecfb264b198a89bcf9b20daf61 SHA-1: 99acb95cd497aa430b7b36de37481e1d687b5254 SHA-256: 8965757a6d4d3dc49130956e773e1a94dfe16dd05aa87ca088b66447cb45bc9a
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 0.8332

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/431946152/roblox-hack-download-pc-game-hack PDF link annotation
    • http://razredna-nastava.net/files/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-kid-friendly-no-human-verification_GM431946152.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_003_off00004e73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E73 27604 bytes
SHA-256: 56177e3042c26f977783fc0a25b6b7f7cb013c9c2982ba6a46ebe326a0553373
font_01_sfnt_off00008e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E98 12800 bytes
SHA-256: db399d969d9309c9c38cb6e3c43aa83c06d227a5470715de93176d1df1e6747d
font_02_sfnt_off0000b66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66F 6636 bytes
SHA-256: 62075f0fe13502d46afb6e55e83d440c29ef4988399537df1f86e7653ce3b744
font_03_sfnt_off0000c67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67C 18844 bytes
SHA-256: 78e662fc8066b17092395b08137e99af0342e3f29fa403ad8e1f9446b0d64eeb

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