Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ee835a9e642668…

MALICIOUS

PDF

45.6 KB Created: 2020-09-04 16:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6f4f443d17bfc8999ce35259f95b246 SHA-1: 9442e9cbc9dbcf50ce0df2bad4613928a151929c SHA-256: a2ee835a9e642668332a7ab5c6358171cd6af090cffb5229fff2cb56f3c2bfd2
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=types+of+audit+reports+in+south+africa'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same redirector URL and appears to be a lure related to audit reports.

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.me/wix?keyword=types+of+audit+reports+in+south+africa
    • https://static.usrfiles.com/ugd/575363_8d356c9e725a4c55a9802946035811b9.pdf
    • https://static.usrfiles.com/ugd/12f4eb_dda884ac5e8a44a7a1ea8bd1fcf8aece.pdf
    • https://static.usrfiles.com/ugd/409ca8_9c83c0d5aeda468386c00699dc32a0e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_93879a5317f44462a68c02a82ce7a5da.pdf
    • https://static.usrfiles.com/ugd/c0a468_7f7dc2adc2ab4c368d23d3a6f8d3f3e4.pdf
    • https://static.usrfiles.com/ugd/99afdc_7cc2ea924b81429aa2bd6a71a9b0ace5.pdf
    • https://static.usrfiles.com/ugd/74a852_bba444ce15e04ea6b199881a2bd5dc34.pdf
    • https://static.usrfiles.com/ugd/82e28d_598d32c912a04f96817cf9ccebf816db.pdf
    • https://static.usrfiles.com/ugd/4c3d6a_fad95c8820974d009587e974dafdf82d.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_a0f53ab1a1e343ea8323c570e0ab3fe5.pdf
    • https://static.usrfiles.com/ugd/be19e1_536cca513f2b43c6a5d235f062461709.pdf
    • https://static.usrfiles.com/ugd/2074c9_ea1fd61f0139447083de92b4eb8d647d.pdf
    • https://static.usrfiles.com/ugd/bb13a2_a9a49890f4b64bba9b11bc0590a4534e.pdf
    • https://static.usrfiles.com/ugd/c0a468_9dde9276e6fc4050ac89447bb2b70670.pdf
    • https://static.usrfiles.com/ugd/60933b_f3ea66a5de764aff8e1bb758e82e9496.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006740.bin
205dc8e26f4c3c1f6dbe83397367514fa4f5766ee13951bc659f31b7f1478407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6740 5144 bytes
font_01_sfnt_off000078bd.bin
9b954326748c74d25d7787d3f3783e501b2883e96db0e9d714e2ed8899f02708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BD 10144 bytes
font_02_sfnt_off00009b74.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B74 4324 bytes

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