Malicious PDF — malware analysis report

Static analysis result for SHA-256 926eb4947d7db858…

MALICIOUS

PDF

54.0 KB Created: 2020-08-24 23:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39f501ea87defdf0fe3d1bb6fc6c35d4 SHA-1: db95aeb66355ff54b3d400472a6dabc57d3c8696 SHA-256: 926eb4947d7db858b3f8d40815fbe6a41f87d972fbe343c13904c9f663ed3e38
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, characteristic of a link farm. One of these links directs to 'ttraff.ru', which is identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains text related to 'manualidades de papel para niños de kinder', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.ru/pify?keyword=manualidades+de+papel+para+ni%25C3%25B1os+de+kinder
    • http://files.ksparkleandshine.com/uploads/1/3/1/3/131398591/febef.pdf
    • http://runerot.111-ed.com/uploads/1/3/1/0/131070420/jutax_fizepaxefafesun_jufuxip.pdf
    • http://duliguz.traversehotham.com.au/uploads/1/3/2/6/132695471/202272.pdf
    • https://cdn.shopify.com/s/files/1/0432/3780/2146/files/23644754392.pdf
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/daletuxirolowevulubutaxib.pdf
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/79275295639.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/gomivifoxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/geguniwabasafasuxije.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8766/files/zipinikurobiwoki.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/appium_studio_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/magakaziwifatududu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3551/6318/files/up_board_marksheet_check_online_2017.pdf
    • https://cdn.shopify.com/s/files/1/0444/5346/2183/files/renago.pdf
    • https://cdn.shopify.com/s/files/1/0431/6987/4080/files/19270948231.pdf
    • https://cdn.shopify.com/s/files/1/0429/9931/6639/files/41893637277.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072ed.bin
9301f6db5326f18d021ff22552f7865a1513359de0cf580745519d7d9bd7566e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72ED 5236 bytes
font_01_sfnt_off0000847d.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x847D 1800 bytes
font_02_sfnt_off00008d0b.bin
45c06761345f3577192d26744e5c6aebf392f379583d7e25878cde5ec1b2f3a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0B 11600 bytes
font_03_sfnt_off0000b2f0.bin
3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F0 16164 bytes

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