Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efa5001255139c3…

MALICIOUS

PDF

38.9 KB Created: 2020-09-18 04:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 142483d923f697a997867bb4fef2757f SHA-1: 41a071e8b5ede944b40f1707f6cdb10a091c1128 SHA-256: 3efa5001255139c3a7eea0eedfe3a703b0171b91ef241031c9432fbebd14c16e
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to multiple links pointing to known malicious redirector infrastructure and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, including the primary malicious redirector URL. No scripts were extracted, but the presence of numerous external links suggests a delivery mechanism for further malicious content or phishing attempts.

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=uml+distilled+pdf+espa%25C3%25B1ol
    • https://cf8ca5d2-a6e9-48b8-8707-87bb59e7aa8a.filesusr.com/ugd/98857b_97ce59d881394921bd9bf80a2809e0e8.pdf?index=true
    • https://8a0ff753-4b3d-4ac5-a45b-fa373f5beed1.filesusr.com/ugd/a2ebd8_5e85aa87046447739d4308992fabdc1d.pdf?index=true
    • https://e2ebc108-8b5b-4d9f-a36c-6ba6f822318f.filesusr.com/ugd/c75f60_01a804db1aea40aa86bb95285e7d5d92.pdf?index=true
    • https://6dfd180f-e2e2-4e3f-b01d-9b3905252b31.filesusr.com/ugd/784815_9be2dc3340a34680b472b05c062f1be4.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0440/4995/7029/files/zefera.pdf
    • https://cdn.shopify.com/s/files/1/0437/2499/6757/files/23763161272.pdf
    • https://b2cb9045-c82c-414a-953f-c8da13403c66.filesusr.com/ugd/7d21c0_5f1a0f314eb14f4d8286a324228af02b.pdf?index=true
    • https://ed697a28-6a49-43e2-84e2-67a486c8fd07.filesusr.com/ugd/9b7d8a_fb496229da35465ba4eb76a4dbef733d.pdf?index=true
    • https://932d219f-e51b-4c60-af6f-c755747a6ebc.filesusr.com/ugd/3225da_39c224a2f9f743fca6bb357aa67fcc4c.pdf?index=true
    • https://755e1609-2a96-4cf8-895a-83bcd0badaae.filesusr.com/ugd/8bc2a6_6d624066a94843df9cab6c46ca04c591.pdf?index=true
    • https://a33f366b-c0f7-4a00-b035-f202b3158333.filesusr.com/ugd/8e66a5_a5341bd42b554f78a14509aeab9a23b8.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/95123221507.pdf
    • https://cdn.shopify.com/s/files/1/0434/2769/2695/files/los_padrinos_magicos_personajes.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_off00004bfb.bin
e317d310f209a0058d8e2d0ef05c532a35340c78f86976fc37d0fd8bad7bdae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BFB 4976 bytes
font_01_sfnt_off00005cd2.bin
a004dcc116562ce10b9ec6fa29b20bfca66dfb70006bdb273c711c1bb24552cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD2 10028 bytes
font_02_sfnt_off00007efc.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFC 4324 bytes

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