Malicious PDF — malware analysis report

Static analysis result for SHA-256 658b63951a523b2a…

MALICIOUS

PDF

43.6 KB Created: 2020-08-24 02:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7191909ddff55cb1ef31e93827d5052 SHA-1: 722a821e6941bc7a04416f0f8b3ed6af0c751081 SHA-256: 658b63951a523b2a4cba8c3b912bc4d7488623566843ceb8e51204aa4fe49ef6
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains text related to dietary guidelines and includes the malicious redirector URL, suggesting a lure to trick users into clicking through to potentially harmful sites. 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.com/pify?keyword=national+kidney+foundation.+dietary+guidelines+for+adults
    • http://files.taichiwithxiaobo.com/uploads/1/3/2/8/132816096/zupufukefi.pdf
    • http://files.ourhousecallvet.net/uploads/1/3/1/8/131857071/semosi-kimixasobal-baxokuw.pdf
    • http://silefe.jihyunhong.com/uploads/1/3/0/8/130814687/zizeginomuxavegi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/bnf_medical_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/3668/0098/files/characteristics_of_successful_entrepreneurship.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4831/files/85751583617.pdf
    • https://cdn.shopify.com/s/files/1/0437/7772/0469/files/40438805636.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/74979810190.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/61042189612.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/21759757973.pdf
    • https://cdn.shopify.com/s/files/1/0457/8620/2278/files/welexitesurugigewak.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/91943540437.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8837/files/kerezobegakigu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/cdc_immunization_guidelines_splenectomy.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6900/files/41578485983.pdf
    • https://cdn.shopify.com/s/files/1/0430/5374/4279/files/bivariate_frequency_distribution.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_off00006ca1.bin
2d16cfc11284f36d144860a3c8c2fc8ce9b8ae35fbf598eaaf76e7b4acb8bc99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA1 5244 bytes
font_01_sfnt_off00007e91.bin
6282632532fd4d7fd53dc3f08d55ff13ed71db8c5d4ee5b84816dc5fbaec94f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E91 10048 bytes

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