Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec485614e456c4eb…

MALICIOUS

PDF

41.8 KB Created: 2020-08-09 13:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c96bef7942303d3ed9b97c2784c8808d SHA-1: fc8f1cdca8d1340b7ca671b72c6c950d3bfeeeac SHA-256: ec485614e456c4ebbda060db18d587c0bdd7633e9fdbd74b354157ce291d80d5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=dise%25C3%25B1o+de+puestos+de+trabajo+en+una+empresa+pdf', is flagged as a malicious redirector. The document body, though partially corrupted, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=dise%25C3%25B1o+de+puestos+de+trabajo+en+una+empresa+pdf
    • http://files.psychoslaughterman.com/uploads/1/3/1/3/131398231/8555462.pdf
    • http://files.dogfriendlyrentalsonsanibel.com/uploads/1/3/0/7/130775795/4872396.pdf
    • http://files.katelyndiane.com/uploads/1/3/1/3/131384635/bumanowor.pdf
    • http://files.korumall.com/uploads/1/3/0/7/130738892/5698962.pdf
    • http://pelulovij.appmarc.com/uploads/1/3/1/0/131070450/povezewevipupir-puvasu-bokovivuvuduxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/xuduxukonedo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/mawetorezerewugixopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0213/4681/files/66287012856.pdf
    • https://cdn.shopify.com/s/files/1/0434/1681/3735/files/kiwemevajokikira.pdf
    • https://cdn.shopify.com/s/files/1/0432/4671/5040/files/paypal_change_password.pdf
    • https://cdn.shopify.com/s/files/1/0449/0087/6455/files/cbse_class_10_sample_paper_2020_science_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jikoleluvotejagumali.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/retigirukanel.pdf
    • https://cdn.shopify.com/s/files/1/0431/3785/9741/files/86011475793.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/gotoxilidobexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5060/6497/files/nulenelukupagirubom.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/pastor_chris_oyakhilome_books_download.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_off0000646b.bin
f8dba51095d92b5b564d9938b39d9b108a480697f36152ebf810ceb7b60051f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646B 5584 bytes
font_01_sfnt_off0000770d.bin
c7910aef70c1cfcfa14e3b93fd7bc847ce0b60d4d9986499f63a925ce730834a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770D 9904 bytes

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