Malicious PDF — malware analysis report

Static analysis result for SHA-256 36832d82d748d6ab…

MALICIOUS

PDF

42.5 KB Created: 2020-08-30 23:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34dd3b7ae44f78c622d38d52f891c201 SHA-1: bfb0aa3a7d97520a1fba3cf50eb9859baeb3028e SHA-256: 36832d82d748d6ab466e8679f26f74dfb877336ea28c939bb8b930e7cae93a98
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to a phishing or malware distribution site.

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=como+vectorizar+una+imagen+en+corel+draw+12
    • https://static.usrfiles.com/ugd/5360f8_5b175595dbb84780a2fb2d3eeb4c1581.pdf
    • https://static.usrfiles.com/ugd/b8c837_6af8fe385d894162a2a89e7976411d9d.pdf
    • https://static.usrfiles.com/ugd/286fb8_d70efde01f334314b748426629833def.pdf
    • https://cdn.shopify.com/s/files/1/0447/3107/2666/files/types_of_cell_communication.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9754/files/61343625449.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/98976623321.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/zezadugowekedalajixi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3841/files/65934122945.pdf
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/fozuf.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/xugogufirotiga.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/warrior_weapon_progression_classic.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/delifogexizivelanigup.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/what_is_a_pointer_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0439/2953/4632/files/90589280304.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_off000065c4.bin
8629732d38837f817a88404613abf28120b998930572e4087c7558052ece6fed
pdf-font-stream PDF embedded font (sfnt) at offset 0x65C4 5372 bytes
font_01_sfnt_off0000780a.bin
32b023be603a3e6633b43a64f9dffa8a186640d5e5e2eb5c694fd807e126f77c
pdf-font-stream PDF embedded font (sfnt) at offset 0x780A 10792 bytes