Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad50af3561c07069…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 08:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b53143a48f6015c3938423a018b1d8d SHA-1: 4e39ff3b175d029bc01324191baf41d8a7025546 SHA-256: ad50af3561c07069da2842b014f95154001bfb511bdc955854d36ad4d64af460
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 one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the URL https://ttraff.me/wix?keyword=principito+y+patria, which is likely the initial lure. The presence of numerous links suggests a link farm or redirection strategy to distribute further malicious content.

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=principito+y+patria
    • https://static.usrfiles.com/ugd/1f2646_71b567beec31463d8bfe0bfa604bd81f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d22b7b1c7ebd4c4f93e4430c7519d839.pdf
    • https://static.usrfiles.com/ugd/5cf23b_428bb2be918c49dc8551a8210d476cb6.pdf
    • https://static.usrfiles.com/ugd/8b2c09_d4086394b15b49e2ae2ee49c2eca66c1.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/rujujokuvugebumopajovego.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8343/files/82014371161.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_45c2892caf6644989b47e2afd91498e4.pdf
    • https://static.usrfiles.com/ugd/1a89c8_5f617a21f4b54fcebf762a7ffbe85560.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ca98d220124fa3a1cbac718eb95ff2.pdf
    • https://static.usrfiles.com/ugd/8b9728_e55e0a6989694437ab0b830e062f257e.pdf
    • https://static.usrfiles.com/ugd/44b221_ac4adc50199445f79fbbfe5223c4243b.pdf
    • https://static.usrfiles.com/ugd/c1de29_0679758c3a514b60a1743c7d4f006985.pdf
    • https://static.usrfiles.com/ugd/8127dd_6fe2763b77d042468799ea772bd0db43.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d73cf8433204135b91e152131b56768.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_off0000604f.bin
80ff8a178c59a4e8b66c8fa4695010a6bf03928b1e37843523f14678d034aaa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x604F 4820 bytes
font_01_sfnt_off000070c0.bin
3713f44a895ea38bcec1ff4feb9242ad454532fb0c32dd6594ab19b8b2723493
pdf-font-stream PDF embedded font (sfnt) at offset 0x70C0 12068 bytes