Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf96df98c655cc8e…

MALICIOUS

PDF

97.1 KB Created: 2020-08-30 03:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ae74eb14cc53d90a4104ee8dd38988b SHA-1: 35536bd8b5de9c30e07ba17c76b35c382372414c SHA-256: cf96df98c655cc8e73b35daf0eb0f11701a6fb77634359858ef08f3b492a36d3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the document's purpose is to lure users to malicious sites. No scripts were extracted, but the PDF structure and link farm heuristic point to a delivery mechanism for further malicious activity.

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.cc/wix?keyword=vivian+schmitt+input+output+throughp
    • https://static.usrfiles.com/ugd/b8c837_2fcc576ca8564adf9185efd0e838529a.pdf
    • https://static.usrfiles.com/ugd/97368a_6f4b08eb359f4ed5b708264097eaa7ad.pdf
    • https://static.usrfiles.com/ugd/d99ef3_039b22d593b34d00bafdcf54e61b0d70.pdf
    • https://static.usrfiles.com/ugd/b8c837_32c6312b111143e9b23d8365ff89c140.pdf
    • https://cdn.shopify.com/s/files/1/0430/5905/2706/files/envato_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2724/1879/files/toyota_altezza_performance_parts.pdf
    • https://static.usrfiles.com/ugd/b5aed9_b4185f88b79b4e1185b0474c24753c88.pdf
    • https://static.usrfiles.com/ugd/4b7290_704680384cce4b888245737ddb92fd5b.pdf
    • https://static.usrfiles.com/ugd/93c935_dc1dc4781b444be3aa541277aace12b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_00b3841e60a445598df8d3c5c2635e84.pdf
    • https://static.usrfiles.com/ugd/b8c837_889bbe83afd54d46bbfef5d9a3a0254c.pdf
    • https://static.usrfiles.com/ugd/1decf9_15e9fe1d45e74002a2117a31f0b5c49e.pdf
    • https://static.usrfiles.com/ugd/b8c837_babffb207e8143ed8cd33ab84d595b2a.pdf
    • https://static.usrfiles.com/ugd/36f25b_de05c2495ac7466abeb88e537c5a3d78.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_off000132b6.bin
dbe08fc7cf94e76a93b239fc899e38779f828d981d315d53cf8f99b0649b6bee
pdf-font-stream PDF embedded font (sfnt) at offset 0x132B6 5104 bytes
font_01_sfnt_off000143df.bin
0feed199f890043adab99d6edaeda950e56fd3a8b51802c5711626424859ab0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x143DF 10812 bytes
font_02_sfnt_off000168cf.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x168CF 4324 bytes