Malicious PDF — malware analysis report

Static analysis result for SHA-256 834e2b1a5b00d529…

MALICIOUS

PDF

60.1 KB Created: 2020-08-20 08:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b60fb6279cb5abdd4b03de6fcbcde379 SHA-1: a1238e78d66ac8a8e1f429032d9647b0d5743758 SHA-256: 834e2b1a5b00d529f1d971894392342d8463db5727af89f71322105be07e46b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other links that appear to be part of a link farm designed to lure users to malicious content.

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.com/pify?keyword=drakor+suspicious+housekeeper+sub+indo
    • http://parotaw.gifgifachance.com/uploads/1/3/2/8/132814097/fenexera_kimir_muxutakexepefa.pdf
    • http://files.sidewisemusic.net/uploads/1/3/1/4/131455621/a4dcd00e.pdf
    • http://files.new-england-marketing.com/uploads/1/3/1/3/131383045/4758049.pdf
    • http://files.katherineeverett.co.uk/uploads/1/3/1/3/131381433/vugokawefiwuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0464/1429/9304/files/grails_render_template_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/54731211531.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/hybridization_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/lessee_information_sheet_bir_excel.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/nuvulelinis.pdf
    • https://cdn.shopify.com/s/files/1/0445/8453/4180/files/windows_caps_lock_control.pdf
    • https://cdn.shopify.com/s/files/1/0440/1309/3029/files/biopsychosocial_assessment_template_doc.pdf
    • https://cdn.shopify.com/s/files/1/0429/1438/1980/files/zuxapasulalege.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0823/files/59255807748.pdf
    • https://cdn.shopify.com/s/files/1/0430/9712/9109/files/18494999724.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/70914445688.pdf
    • https://cdn.shopify.com/s/files/1/0430/9522/8565/files/vudus.pdf
    • https://cdn.shopify.com/s/files/1/0438/2988/7136/files/ms_sql_developer_tutorial.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/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000705d.bin
670d62e7e3a270cb6a0b2b2c79f16bf47803e8993a9b5a721167efd91c7bbf57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705D 5152 bytes
font_01_sfnt_off00008296.bin
0bc6a3636df6b75d707a8a3e65b7a3103df147a6f2b0492d9c33dc45b33754e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8296 5332 bytes
font_02_sfnt_off0000949d.bin
65ad7319df2f1fa297ce699c772dcb3d6ae604d29bbeac17dbf693145ac18e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x949D 8500 bytes
font_03_sfnt_off0000ac36.bin
2ff0d7c3521b30b492b5b49e796aa22717a615944446885550ba250016f24933		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC36 17616 bytes

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