Malicious PDF — malware analysis report

Static analysis result for SHA-256 da89a636f12e7d92…

MALICIOUS

PDF

154.9 KB Created: 2020-08-17 13:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca54ae26dcff09bcb04ef87877e6c514 SHA-1: 80a763bc91cc95cbf9514c6c98f83a0ad83dc4df SHA-256: da89a636f12e7d92ccd3655af7c987248bafaae1639ae348561a851cb2778702
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing indicating a malicious redirector link. The embedded URL, 'https://ttraff.com/pify?keyword=candidal+intertrigo+treatment+guidelines', is the primary indicator of malicious intent, likely serving as a lure for further malicious activity. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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.com/pify?keyword=candidal+intertrigo+treatment+guidelines
    • http://files.brettvandonselmusic.com/uploads/1/3/1/4/131407274/wimabo-jevilofuxipot-fuwekizerosi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5352/1823/files/88600855823.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/jexarigemudaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/8149/6744/files/zudat.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/xujadetix.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/nezisamuzinil.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/3128889769.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/fuseludu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7807/1960/files/carlsberg_annual_report_2006.pdf
    • https://cdn.shopify.com/s/files/1/0437/3548/2517/files/aspiration_pneumonia_in_neonates.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1293/files/91749429277.pdf
    • https://cdn.shopify.com/s/files/1/0446/6540/5603/files/commands_used_in_linux.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_off0002039d.bin
cc990fb93c963aa300ffe47003f8712e8a9d7e4f15d6d52bb2811fa3d3d6fdd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2039D 5052 bytes
font_01_sfnt_off000214aa.bin
1641a3564cfc882ccfa13dc7145630257bf015a1598579672b3dd28c1776fbfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x214AA 10900 bytes
font_02_sfnt_off00023a15.bin
4f4d90158378c88ce7ff861de9f04244e70bc9dceca796a054e4a6db4c7af747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23A15 16272 bytes
font_03_sfnt_off00024f88.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24F88 4324 bytes

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