Malicious PDF — malware analysis report

Static analysis result for SHA-256 d117c765e0d1e203…

MALICIOUS

PDF

38.5 KB Created: 2020-09-18 17:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aacaef1a423a1a29132eba51690b165 SHA-1: 835e99f22816d885e3d6c8ed38a152be9f370e63 SHA-256: d117c765e0d1e203563deff79cd9514c54d20a52a76a86c2e7f3ddd362be7828
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to potentially malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for 'edhesive 2.8 code practice answers', directing users to the malicious URL https://ttraff.me/wix?keyword=edhesive+2.8+code+practice+answers. 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.me/wix?keyword=edhesive+2.8+code+practice+answers
    • http://petusul.doublebassbridge.com/uploads/1/3/0/9/130969862/ec2950b0509050.pdf
    • http://limamax.internationalrunwayawards.com/uploads/1/3/0/7/130739457/8333705.pdf
    • https://10ca1b36-379f-404a-9482-ae1fb0ab465d.filesusr.com/ugd/33ab24_026c5235e40946d5acb00829ccabedb5.pdf?index=true
    • https://d0443eb3-da34-4dee-a3a7-04ea691db41d.filesusr.com/ugd/384ea4_481ca3cee6234dff9aebd42b74988662.pdf?index=true
    • https://6ff33e81-26ab-4f24-b1c7-75d28b12330e.filesusr.com/ugd/120f26_d5b4456df86e4e41aca44eeb52129f82.pdf?index=true
    • https://a2e2b165-26b0-475e-a7b1-cbd5b0dd5b28.filesusr.com/ugd/b7082a_67886ae7c52f48d9a848f80921c3db71.pdf?index=true
    • https://6954de14-2196-4fa3-a93d-8d6a5026d1b5.filesusr.com/ugd/69b86f_ebb32cd88a714b16ba6688458ca7a42e.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0438/2231/7730/files/23881770865.pdf
    • https://cdn.shopify.com/s/files/1/0433/3332/0872/files/98949956220.pdf
    • https://caed34d6-7225-4db5-af4b-18e56253d8fa.filesusr.com/ugd/30e015_ed1314b53b8a433a89f40cebea79b35a.pdf?index=true
    • https://8f926b3e-e479-4ee5-a0da-663dbaf87767.filesusr.com/ugd/fe83c3_623ff716e4084e5294b67e289e297dde.pdf?index=true
    • https://444bc8de-c7bd-41c7-a5b4-acb4deaeec7a.filesusr.com/ugd/b81754_ada044ff9a0249638cccbd03d2469614.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005782.bin
2f773fa4555068d24a150803e2c7a8519a7278330167788f486ee26f0ec73e1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5782 5596 bytes
font_01_sfnt_off00006aa5.bin
eaa4f869579dd16d526497a02dfc8df07c01a7e5cc5db0bcd4f756335adda715
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA5 10196 bytes