Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cebc68c176e301c…

MALICIOUS

PDF

46.5 KB Created: 2020-10-03 00:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 05626383903000c1c69bf5df93abfe78 SHA-1: e600ab73cd3ea8f649443f31fbf37fce219bbbd0 SHA-256: 5cebc68c176e301cb8ce8b9ebdb0c801ab91be391e3986a3e6aab1ed02a97789
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to direct users to malicious sites.

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://ggtraff.ru/strik?keyword=iso+13934-2+pdf In PDF document text
    • http://mevotiju.hrcesocialstudies.ca/uploads/1/3/0/7/130776299/pakisika.pdfIn PDF document text
    • http://files.nowordspoetry.com/uploads/1/3/1/3/131398224/doxoragotez.pdfIn PDF document text
    • http://files.iacmtc.fr/uploads/1/3/0/7/130775427/nidefitisuwaj-xabadi-wefipukigud-geforonab.pdfIn PDF document text
    • https://site-1039156.mozfiles.com/files/1039156/xezufuxaxirobapodipam.pdfIn PDF document text
    • https://site-1037029.mozfiles.com/files/1037029/nezipikirodugadadober.pdfIn PDF document text
    • https://site-1037086.mozfiles.com/files/1037086/disoxewis.pdfIn PDF document text
    • https://site-1040125.mozfiles.com/files/1040125/97042230160.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/75411536310.pdfIn PDF document text
    • https://site-1036730.mozfiles.com/files/1036730/26462832815.pdfIn PDF document text
    • https://site-1037914.mozfiles.com/files/1037914/kumegosoni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13ae4d7-decb-48a6-874e-656af9b9aa48/76871691731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e2415c-97d4-4192-9173-6c5932e17750/48514829393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/009558ce-6072-4d9f-a803-f2b757d54961/fumunirinuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d150d47-d5e0-4dbf-adc7-09654a257b18/fesajiv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D72 3080 bytes
SHA-256: 8574919c7c8a9f024103958ce015253c5a24b8e646cdb5f787658918713f2b2b
font_01_sfnt_off0000787a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x787A 5260 bytes
SHA-256: 2e1231969b5cc2ae387c6d4a8472b8f11d75caf3897c4b580088bf6e062b55e2
font_02_sfnt_off00008a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A83 10328 bytes
SHA-256: bc93183681f7ced0b4055c22181979acde0911a60832b0a258637993f6e8f8bb

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