Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5139598b331fc8…

MALICIOUS

PDF

46.7 KB Created: 2020-10-02 12:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8fd9fb8f555385e7b190a22d1134aa49 SHA-1: 578c630f1c7bb48f07ec434c08e2d71588054672 SHA-256: 0c5139598b331fc8a6a97b9940c30152200005070e31d51e6a2a5e9eec838f54
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable domains and redirector services, indicating a link farm designed for SEO manipulation or malicious redirection. The document body, though obfuscated, contains text suggesting it is a 'webquest answer key' and includes URLs that are likely used to distribute further malicious content or lead to spam. The ML classifier strongly flagged this PDF as malicious.

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.
  • 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://gettraff.ru/pify?keyword=sensory+organs+nervous+system+webquest+answer+key In PDF document text
    • http://zexevonu.awynterstyle.com/uploads/1/3/0/7/130739561/0a47c.pdfIn PDF document text
    • http://files.convictroad.com/uploads/1/3/2/6/132682998/pawuwubuxo-lovowegim.pdfIn PDF document text
    • http://files.domicilehomewood.com/uploads/1/3/1/6/131606472/juvowirasitezalipugu.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/59136538777.pdfIn PDF document text
    • https://site-1036946.mozfiles.com/files/1036946/75582398823.pdfIn PDF document text
    • https://site-1037088.mozfiles.com/files/1037088/57829781515.pdfIn PDF document text
    • https://site-1038635.mozfiles.com/files/1038635/tadibivoro.pdfIn PDF document text
    • https://site-1036838.mozfiles.com/files/1036838/bafigixowuposevar.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/1/0457/3754/1798/files/electric_yellow_cichlid_tank_size.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6773/8786/files/filotapuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4620/2272/files/text_structure_sequence_of_events.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e0c2ba-c289-4d5c-994a-d0cd56d632ff/17454934749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e441da38-de6c-4afd-b4e7-75bc2017d1b9/75433758458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89cedf1-4221-489b-bb22-da76c45e4fb5/32348772894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf2cb70-1cff-4b17-a764-29669ee4e6ed/muvigi.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_off00007b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5D 5660 bytes
SHA-256: 6c9c8af7e839946061d34638f5a07c026d06e3423569b41e4964e6ca2e5aaf23
font_01_sfnt_off00008ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA7 9088 bytes
SHA-256: 24b0aea7cea3083d1c5c56c4b3e5b3033c2fa93dab94c4612cd92c63a31b9f92

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