Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef5201d4820766c…

MALICIOUS

PDF

44.4 KB Created: 2020-09-05 22:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65675a12868ff871328da6051df5abed SHA-1: 69b56a54053e393d1137331217dfc6b4bbc11fa5 SHA-256: 4ef5201d4820766c0a3d36f248648fc740da44550595a20f318063233c47ee0d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure. One prominent link, presented as contact information for 'Zračna luka Zagreb', redirects to a known malicious domain. The presence of numerous external links suggests an attempt to manipulate search engine results or distribute malicious content through 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=zra%25C4%258Dna+luka+zagreb+informacije+kontakt
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e5412a_3be40008e9c54817bed5d51e8a7da32f.pdf
    • https://static.usrfiles.com/ugd/7dfe85_0329f85dcdd64326a805229ec15f5f39.pdf
    • https://static.usrfiles.com/ugd/2b3f46_1f844eb4088a47bbbbb4d4e0b7013029.pdf
    • https://static.usrfiles.com/ugd/f96b02_ef6a3a49615140c99a2e06af49799ba5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b80571a74ef743bb8a606f7238b92152.pdf
    • https://static.usrfiles.com/ugd/ae059d_6d9c81141edc4c0a88e2051e3a254ed2.pdf
    • https://static.usrfiles.com/ugd/badafb_4ccfcebd73bf415eb79f0d129674efbb.pdf
    • https://static.usrfiles.com/ugd/b1b3ad_69a2134dde004d9991cb13102d1a71c6.pdf
    • https://static.usrfiles.com/ugd/374ce0_b07734ad926c41e4bf1a482eff621935.pdf
    • https://static.usrfiles.com/ugd/374ce0_7c7d116facf04a59be8605aa0423f6a2.pdf
    • https://static.usrfiles.com/ugd/12f4eb_861a161c956f4ce38c426f2295a06933.pdf
    • https://static.usrfiles.com/ugd/cf14a4_0422a1528ae5466fb97b23a8c8c84821.pdf
    • https://static.usrfiles.com/ugd/78c764_6d17c72074664c48b402cfd1be968df5.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005db9.bin
fef2a9d0853efec1dbe2eadf14f496cabc003329d52d9d83454d1ab3afbb2e5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB9 5456 bytes
font_01_sfnt_off00007001.bin
07e8ff603c4f02b89448a35c07b8bac1331ef0dfbf0fc815bc1473a0e79b8afa
pdf-font-stream PDF embedded font (sfnt) at offset 0x7001 17160 bytes