Malicious PDF — malware analysis report

Static analysis result for SHA-256 c541fce8cd2fdb3f…

MALICIOUS

PDF

43.5 KB Created: 2020-08-29 14:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c969cd26077b6ab486d8aa0bef234643 SHA-1: 837890da50a168f6d27aa6636d32e9208506ef73 SHA-256: c541fce8cd2fdb3f859bd63d7c8e02b1bf27c5b2b179d3e4fdd30685b51111ce
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to known malicious infrastructure. The primary attack pattern involves luring users to a malicious site via a link farm.

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/wix?keyword=adestramento+inteligente+pdf+completo
    • https://static.usrfiles.com/ugd/b8c837_5be4f193f219455d8047db8ff99135ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_54aad7d810dd4103ae80cbe8a25fa19b.pdf
    • https://static.usrfiles.com/ugd/b8c837_86e0a1df3c06419284ae1ae96e394199.pdf
    • https://static.usrfiles.com/ugd/b8c837_e35fb9174f764b579e129f622a8f2444.pdf
    • https://static.usrfiles.com/ugd/b8c837_2162611fe1b243b7a8ade55af71b7961.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7472894cf8c4921895d0f1fdb15bfad.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6ac113f8e6549f38de29ca44eaa6dad.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e08d37e535c43a5b82f4c78f1e535e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e91c8ffad224240b9b6ae6b2fc36491.pdf
    • https://cdn.shopify.com/s/files/1/0433/9374/5046/files/gevapadipu.pdf
    • https://cdn.shopify.com/s/files/1/0462/6645/0074/files/59349109017.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/85027219785.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/patirilibuba.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4918/files/domuvesowuveli.pdf
    • https://cdn.shopify.com/s/files/1/0450/0389/9048/files/racing_uk_programme_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/3361/6803/files/93909682913.pdf
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/windows_file_names.pdf
    • https://cdn.shopify.com/s/files/1/0433/5999/4014/files/technical_communication_today_5th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/vuniso.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ab7.bin
5e1d35f88304a6b92f07892067cf9f54b6280e4d4200a5e47fbead9e174e203c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB7 5464 bytes
font_01_sfnt_off00007d36.bin
8187adca331f681a3ff0dbf03d6f2ad71ec3f52a152a6d5f74cdfdb9a1d25cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D36 10316 bytes

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