Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec90a129ecadd2e…

MALICIOUS

PDF

46.1 KB Created: 2020-07-15 20:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57d2b7d328f2e2ef32b38a17672c6880 SHA-1: 780b1ef50e44cf02ca59f72c99e4cf813e989247 SHA-256: 5ec90a129ecadd2ec03b271480a950f1a4193c34d7663d76a6c56acabbc699e1
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 WordPress domains that host other PDFs, forming a link farm. One prominent link redirects to a known malicious domain, ttraff.ru, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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.ru/wb?keyword=how%20to%20improve%20concentration%20pdf%20download
    • http://files.delightfullyfit.org/uploads/1/3/1/4/131452778/9588263.pdf
    • http://files.caid.org/uploads/1/3/1/4/131437636/sefusobeduweg.pdf
    • http://files.andicho.com/uploads/1/3/1/4/131438019/1955e70afeb689b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://navurigafevu.files.wordpress.com/2020/06/zibetanunix.pdf
    • https://wemujaju.files.wordpress.com/2020/07/93748376071.pdf
    • https://wejanokavak.files.wordpress.com/2020/07/65654822225.pdf
    • https://murivavuj.files.wordpress.com/2020/07/getoxusameroxat.pdf
    • https://fowexafo831514887.files.wordpress.com/2020/07/jaladutivaxefefofa.pdf
    • https://buzuboxovova.files.wordpress.com/2020/07/banotowetipasefujimebajog.pdf
    • https://befevimupa.files.wordpress.com/2020/06/vuwimokexogumapasar.pdf
    • https://solanimozo.files.wordpress.com/2020/07/38758514927.pdf
    • https://gimiwativis.files.wordpress.com/2020/07/nezinoguzegepenimed.pdf
    • https://foburabowo.files.wordpress.com/2020/06/17361646034.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/kufoga.pdf
    • https://cdn.shopify.com/s/files/1/0434/9765/2376/files/7176320818.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54058680795.pdf
    • https://cdn.shopify.com/s/files/1/0427/4742/9031/files/39823068966.pdf
    • https://cdn.shopify.com/s/files/1/0433/6038/7227/files/rosiru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3895/files/91515004783.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/nutolugixe.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_off0000771c.bin
e25bb1a224d6c6655f43f8f4bee33ef1782d45f7fb1062685641100f8c044fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771C 5024 bytes
font_01_sfnt_off00008829.bin
dcff1ae597b6a853d489fef1c58c211d0214827927ddfbf3bc9ca13744105ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8829 10088 bytes

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