Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ab7603e46c40cf…

MALICIOUS

PDF

39.1 KB Created: 2020-09-04 21:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a8dd192ca7d8877706e00d35cd84d7 SHA-1: d7ec4042edfe5fd42644bedbfe6bb8e1727af7bf SHA-256: e9ab7603e46c40cf5970bd993ea850ce605dce0ddd2b101a8ca4ac3d03ccfcd8
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, with a critical heuristic firing for a PDF link to known malicious redirector infrastructure. The document body, though garbled, contains text related to a lab report and a URL that appears to be part of the malicious redirection chain. The presence of numerous links suggests an attempt to distribute malware or conduct phishing by directing users to external, potentially malicious, sites.

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.link/pify?keyword=identifying+macromolecules+lab+report
    • https://static.usrfiles.com/ugd/a72fa8_ad7eba6a625e482396485bf5a04ffe4c.pdf
    • https://static.usrfiles.com/ugd/89441e_3e300e6717a14b41ae185f6219ecedcb.pdf
    • https://static.usrfiles.com/ugd/6846fe_386ab2f26b374f9588915d8b28b7b397.pdf
    • https://static.usrfiles.com/ugd/54b9a1_989f9f2b62804a9e86fbd83c2e41f03a.pdf
    • https://static.usrfiles.com/ugd/d162e3_192673dff45240eab40b87e5fee84bc6.pdf
    • https://static.usrfiles.com/ugd/3b5dd9_9b6c91ba1152470080cc7be41a128a8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_564deff84aeb4a55a3c3a274bbc38376.pdf
    • https://static.usrfiles.com/ugd/ca300b_f25659ad37ee47ca90c35d615937038f.pdf
    • https://static.usrfiles.com/ugd/269bb8_366bb52c50cf4738b27c20a41848df3c.pdf
    • https://cdn.shopify.com/s/files/1/0433/5796/2405/files/buwaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4435/files/vuvizur.pdf
    • https://cdn.shopify.com/s/files/1/0462/3899/0485/files/82624150378.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/rozujubijilugapukuwimaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/gititofezugapizoropaguwup.pdf
    • https://cdn.shopify.com/s/files/1/0440/4923/6118/files/wesewu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8643/files/da31_fillable.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_off000058de.bin
eff622b51fa576c1018d3cba389a6d886bbd997375d417b93528227e92126c63
pdf-font-stream PDF embedded font (sfnt) at offset 0x58DE 5656 bytes
font_01_sfnt_off00006c07.bin
7f6066f9304fa7129824312edf08a76616b0ec36f97c08025a454faf0cff6d93
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C07 10588 bytes