Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d0f5913c3c3d1d…

MALICIOUS

PDF

41.7 KB Created: 2020-08-19 18:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7db710ad6b5cb354b77b8c8069b29b4 SHA-1: fc093599d4128e2f625bffec9ef4b30900f71ef3 SHA-256: 48d0f5913c3c3d1d4eacdb0b4e1db5af3af8315877e2a4a305a92db13cc9a3f4
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a "West Covina Parks and Recreation Guide" but redirects to a malicious URL. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary goal is to redirect the user to a malicious site.

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/pify?keyword=west+covina+parks+and+recreation+guide
    • http://files.greenvillepreschurch.com/uploads/1/3/0/8/130873930/603360.pdf
    • http://files.aben4ace.org/uploads/1/3/1/4/131406391/ca3ed87fc8b5ee7.pdf
    • http://files.annakeo.com/uploads/1/3/1/0/131071056/ragomufaxezilegovitu.pdf
    • http://zakupu.rubenfloresjigs.com/uploads/1/3/1/4/131452922/1755828.pdf
    • http://files.artfullyfrosted.com/uploads/1/3/1/8/131856224/4fadfd51955bd.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27347714529.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/66111304775.pdf
    • https://cdn.shopify.com/s/files/1/0430/5993/7434/files/trmovies_2018_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/2617/6407/files/29895311483.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4071/files/21169226094.pdf
    • https://cdn.shopify.com/s/files/1/0440/7204/2661/files/oxford_dictionary_of_foreign_words_and_phrases.pdf
    • https://cdn.shopify.com/s/files/1/0438/0459/0242/files/97824980864.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93434530871.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5965/files/23327930580.pdf
    • https://cdn.shopify.com/s/files/1/0434/2516/9565/files/vawojenak.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/powomefi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005417.bin
41b6923caaa053ee296dde84c868c26e08488cedfdcce13a99f37d1e4b9344dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5417 5228 bytes
font_01_sfnt_off000065fb.bin
530bf4c18f7185132a4439d8c49e9d65d7c70c729d0bbea11c43772857a99d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65FB 10452 bytes
font_02_sfnt_off000089cd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CD 4324 bytes

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