Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eab9ff81686a895…

MALICIOUS

PDF

41.2 KB Created: 2020-08-05 17:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af919d2e0019c6f483e022455868feb5 SHA-1: 5690ac1e53198427b49cc07395914e039aaaba94 SHA-256: 5eab9ff81686a8953758d6d3ede77ee0b6d6ea2766c738f4a55cafbb154152b4
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The primary malicious link identified is 'https://ttraff.cc/pify?keyword=arens+auditing+and+assurance+services+pdf', which likely serves as a redirector to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains embedded URLs consistent with this link farm behavior.

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/pify?keyword=arens+auditing+and+assurance+services+pdf
    • http://files.susannahnix.com/uploads/1/3/0/9/130969048/nefolekilad.pdf
    • http://files.teviasa.com/uploads/1/3/2/7/132741225/4959704.pdf
    • http://files.dbs-fabrication.co.uk/uploads/1/3/0/7/130739549/7659488.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3537/7307/files/rejamukuwopironelozerefoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/megovenudilusubum.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5377/files/6867579398.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3687/files/abby_pollock_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/jukipobemekapo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/setoxavud.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1173/files/nofoganijopazefejepugati.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/seresazinonatibusem.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/solar_eclipse_and_lunar_eclipse.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/26460457274.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/vesoninirago.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/foluzogoji.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_off0000595d.bin
b9f31a73bc683f65f1d3f8ea47dd1de625f64a6affbae58e7d0b3aa1cd4f25a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x595D 5340 bytes
font_01_sfnt_off00006ba9.bin
01d7583aab6be098bcb3f81907559bb6d5c020e79c469beca1b564f3de3d8b5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA9 14388 bytes

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