Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4ddbad73449fdc…

MALICIOUS

PDF

72.5 KB Created: 2020-09-02 00:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08cde1ce2c1619579970b1704bcdb2cf SHA-1: 926aee064b283d01eceb28b91b6dc01bef056c41 SHA-256: 8a4ddbad73449fdc346fb5ec1e178b53e24b8968a025101f4adb6fa7c1a18523
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is designed to lead users to harmful 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.ru/wix?keyword=inverse+of+matrix+by+adjoint+method+pdf
    • https://static.usrfiles.com/ugd/5926b4_1d1402fbe6874344ad6eb041423fef74.pdf
    • https://static.usrfiles.com/ugd/33a16d_31f7348275494334b9e7c3eee38984ce.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_51500828a2bd413faa90e7af98c681a1.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/kefavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/joloti.pdf
    • https://cdn.shopify.com/s/files/1/0437/7722/8957/files/vasoguw.pdf
    • https://cdn.shopify.com/s/files/1/0429/0881/1427/files/kirk_franklin_melodies_from_heaven.pdf
    • https://cdn.shopify.com/s/files/1/0447/9811/6006/files/wallpaper_city_guide_berlin_app.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/93247202920.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/49136990142.pdf
    • https://cdn.shopify.com/s/files/1/0435/3576/1576/files/java_tictactoe_code.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7920/files/captive_prince_short_stories.pdf
    • https://static.usrfiles.com/ugd/805d2a_3455d15186744665945fa83460461540.pdf
    • https://static.usrfiles.com/ugd/e5412a_2e95d932367a45e0aefe7e60d64050ed.pdf
    • https://static.usrfiles.com/ugd/2b25b5_d90ac7b8cdc845f49d7bd3de08f2dfef.pdf
    • https://static.usrfiles.com/ugd/13ae68_c9bdb53515034e108f76bc2ec7ab343c.pdf
    • https://static.usrfiles.com/ugd/a2e20a_dab29b88028c4402be4bcc55bc6ecbdd.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f28.bin
6449c9aa6a615cef405023f4d5bde7fd99e60c016f89d513ad777dadd9860be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F28 5420 bytes
font_01_sfnt_off0000b161.bin
bf1804cbcf83f836578c5dbfda0438c9899b1b6a4352db3ffc2e86e67f94985b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 2172 bytes
font_02_sfnt_off0000bac3.bin
0d3690d9ac851f1c8d6aad4e86dbdac94aeee335834019656115b88a31a6f947		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC3 16812 bytes
font_03_sfnt_off0000ef33.bin
6084706b698b262ab3d633ce783c6a450ba7cd1a6a97b8f0132746cf2f0912b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 16504 bytes
font_04_sfnt_off00010594.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 4324 bytes

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