Malicious PDF — malware analysis report

Static analysis result for SHA-256 367555706a6c3884…

MALICIOUS

PDF

40.6 KB Created: 2020-10-05 12:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0b8aa9865eb94ddcaae3c0fea58dd501 SHA-1: 7e420b4680ed25ceae6177e8cfe3c3e6977bba77 SHA-256: 367555706a6c388481e81864d0175c2bedf12f0a23db4e0cdb724ebbf090e772
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'algebra 2 common core textbook pdf free' and a URL that appears to be part of a link farm designed to attract search engine traffic. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring users to click on these links, which likely lead to further malicious content or phishing attempts.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=algebra+2+common+core+textbook+pdf+free In PDF document text
    • http://files.funactingstudios.com/uploads/1/3/1/3/131380415/nimizaxe.pdfIn PDF document text
    • http://files.atlaslearningacademy.com/uploads/1/3/1/3/131380596/judumanozotetegir.pdfIn PDF document text
    • http://jusenuj.mywstudiospa.com/uploads/1/3/2/7/132740366/2026219.pdfIn PDF document text
    • https://site-1039918.mozfiles.com/files/1039918/59348237251.pdfIn PDF document text
    • https://site-1040427.mozfiles.com/files/1040427/vekagebudaba.pdfIn PDF document text
    • https://site-1039877.mozfiles.com/files/1039877/7961821165.pdfIn PDF document text
    • https://site-1041614.mozfiles.com/files/1041614/65204184276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/3050/5628/files/bepolonubokavisil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6668/6629/files/unit_circle_activity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4673/1930/files/jones_meat_market_saranac_michigan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/vebajogujib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/61746580298.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1907/4198/files/45487408769.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB7 5688 bytes
SHA-256: c2aabd4950ce38a09a382f3e3b8b02485969b1b7fbe402d25f2c1fadba4020d9
font_01_sfnt_off00007207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7207 10412 bytes
SHA-256: fbf1646a3eb95521776c13d8b984a80c4566f5343d3a5edf7e93cf267850490f

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