Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0e13db15fcebbb…

MALICIOUS

PDF

93.5 KB Created: 2020-09-16 21:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 254d66de634cbc44732e73c75b0716ad SHA-1: d5382f37461416b9d76fdbde606c78f9ac843afc SHA-256: 9b0e13db15fcebbbbdd3f091b4936de83d373ed0f6ac3d1975e86edd930e6f15
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wb?keyword=yu%20yu%20hakusho%20online%20subtitrat%20in%20romana%20toate%20episoadele'. This URL is embedded within the document body, suggesting a social engineering lure to trick users into clicking it. The presence of a large number of external PDF links further indicates a link farm designed to obscure the true malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wb?keyword=yu%20yu%20hakusho%20online%20subtitrat%20in%20romana%20toate%20episoadele
    • https://be0329ed-a43e-4fe2-87d4-bba1e71d529d.filesusr.com/ugd/9ea91e_cdfce20881e8448eb7fbb56b2b1d5d27.pdf?index=true
    • https://404a488c-dc49-42ce-a59f-753b6a2f24e6.filesusr.com/ugd/e2f7e1_92a81215f3cb460a9f7d77514f5292ee.pdf?index=true
    • https://cded5dd8-6e2d-40d3-8a9c-21fdc5203147.filesusr.com/ugd/7f614e_fcc52ae91c1b46349e963593835eaf33.pdf?index=true
    • https://3b056028-006d-4746-82a2-816b2f29c210.filesusr.com/ugd/66f3f9_d11dfca3fbb54896a182a0b5de572779.pdf?index=true
    • https://d33b4733-3d6f-44be-87dc-a9c37c73cdc7.filesusr.com/ugd/7598fa_b69e0a40baf948f3985115d915ba6693.pdf?index=true
    • https://226fecdb-746b-4ddb-9166-4a29292bd363.filesusr.com/ugd/b926a8_c703cb886a524a299f55dbc69258f1f6.pdf?index=true
    • https://ea4e2ebc-698b-463a-90b5-058f2e303631.filesusr.com/ugd/529dbf_4ce0f6cdba694e139e9e0caf2d21e14f.pdf?index=true
    • https://02a54c8b-efa8-4ea0-aeb3-aa1e60afe4ab.filesusr.com/ugd/451a43_b0be8687d8664cb7a6e10f486482bb97.pdf?index=true
    • https://8f6e012d-7817-41bb-9051-037ee9e69516.filesusr.com/ugd/44b221_c5eb800ffc6a4bc286ed91a687e43582.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/7016/8992/files/91431171985.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/60352011406.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/fafebadekekevelipixe.pdf
    • https://877cfc73-2659-40c3-8e9a-bb4b57240f60.filesusr.com/ugd/610d21_50e7b275308344ea82075e6e49b5d1cc.pdf?index=true
    • https://00efe3f3-82ea-40d5-9571-c2f905452a6d.filesusr.com/ugd/8c0e65_54839578a68d4e87b35e9fcfe33c54b2.pdf?index=true
    • https://cabd68be-7aae-4562-96c5-5baa8cb929fd.filesusr.com/ugd/6f7357_46c70574043e4d4ea1691e89556ec273.pdf?index=true
    • 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_off0000e18c.bin
f1c1a466888fa16e10114948275523a4b2a49aeb224e4c133798d53c714eeadd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 11280 bytes
font_01_sfnt_off000106b0.bin
d95ba5c5ec9b82c467a60d014beb2b32de6d85ef1934c026c92fb534eb44151e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 5464 bytes
font_02_sfnt_off00011917.bin
82b500f68674ca9b358176775582b72c29c5e147252b9a086c38ea79864b8913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 19596 bytes
font_03_sfnt_off00014fea.bin
24492e4c32f1f0d90abb4f633d5ddc098b99fc4d2ecb5716ccbf2264982e91d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEA 16208 bytes

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