Malicious PDF — malware analysis report

Static analysis result for SHA-256 642822b4271398c5…

MALICIOUS

PDF

54.8 KB Created: 2020-08-08 08:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7121f52c2f306cc85365af567fa56d3a SHA-1: 03e02b914938e2e393f258d8d52e022b21f02980 SHA-256: 642822b4271398c596218be5db4ae1082a2434dd0715c0a5cde308fb6093a9cf
194 Risk Score

Malware Insights

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

The PDF contains a fake CAPTCHA lure, designed to trick users into clicking embedded links. It also functions as a link farm, with numerous external links, one of which points to known malicious redirector infrastructure. The document body itself contains obfuscated text and a URL that appears to be part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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=web+application+security+testing+interview+questions+and+answers+pdf
    • http://duvokafo.catstitchstudio.com/uploads/1/3/2/6/132682090/1636654.pdf
    • http://files.cakradesign.com/uploads/1/3/0/9/130969430/vexuri.pdf
    • http://files.annasboldjewellerydesign.com/uploads/1/3/0/8/130814411/9935894.pdf
    • http://files.support.famhealth.com/uploads/1/3/1/4/131437740/3357936.pdf
    • http://nunuxawa.srd.dbbcso.org/uploads/1/3/0/7/130740596/7326481.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/xeferosenowisar.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/fudikajani.pdf
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/50927012585.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/6228512686.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2345/files/catalogue_armoire_electrique_schneider.pdf
    • https://cdn.shopify.com/s/files/1/0453/3098/9211/files/albert_camus_libros_el_extranjero.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/22439981072.pdf
    • https://cdn.shopify.com/s/files/1/0434/7658/2552/files/how_to_make_smaller_size_windows.pdf
    • https://cdn.shopify.com/s/files/1/0435/1682/1672/files/strength_of_materials_important_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/vegexujabiberenufiwisi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6621/2003/files/49692485383.pdf
    • https://cdn.shopify.com/s/files/1/0434/7786/0516/files/45290573516.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/jaak_panksepp_affective_neuroscience.pdf
    • https://cdn.shopify.com/s/files/1/0437/4301/9159/files/900_english_business_sentences_full_unit_01_30.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_off000093a0.bin
7be96a9e3ed37597c14277c148693050a2822709d75ad46431b0e590d7ad0f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93A0 5856 bytes
font_01_sfnt_off0000a7b2.bin
27f52033d73ece23c0ef45bc1892948d1f631bb92d91ff1d34b4786728811238		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B2 10808 bytes

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