Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfbc1510b1d05d83…

MALICIOUS

PDF

43.8 KB Created: 2020-10-01 15:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 77d5cd79b78d78e4692302c0415ecc19 SHA-1: 73b18c1640f0f99db954b681e4128f37c880e0c6 SHA-256: dfbc1510b1d05d83c6c4fcb726f565f91e39133ac33479f41f3ee59252e488c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to medical treatment and URLs, suggesting a lure to a malicious site. The presence of a malicious redirector and a large number of external links points towards SEO poisoning or a phishing attempt to drive traffic to malicious infrastructure.

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://cctraff.ru/strik?keyword=adenitis+mesenterica+tratamiento+pdf In PDF document text
    • https://site-1036676.mozfiles.com/files/1036676/34403553708.pdfIn PDF document text
    • https://site-1036759.mozfiles.com/files/1036759/29038025078.pdfIn PDF document text
    • https://site-1036656.mozfiles.com/files/1036656/mopowuf.pdfIn PDF document text
    • https://site-1037026.mozfiles.com/files/1037026/12665014576.pdfIn PDF document text
    • https://site-1037156.mozfiles.com/files/1037156/63259641859.pdfIn PDF document text
    • http://lonoget.easternstarschool.org/uploads/1/3/0/8/130814297/setazemojox-nupaxuxi.pdfIn PDF document text
    • http://files.raquelmeraki.com/uploads/1/3/2/7/132740860/3354846.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/1/0431/4752/6305/files/vortex_venom_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/75010635709.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89709194360.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4372/4186/files/sovirorazusuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e80cea8-2916-46e6-9b04-c49eebf0ad19/fetuvuson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fc7d2a-2e15-480b-bbb6-e4392bc834d1/51196098903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b17c6eb-2626-41b9-9d03-2b1841145a68/31324891053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d321d6-e4aa-4af8-add3-7a4ce4935b55/kuxarotosoz.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_off00006b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B13 5260 bytes
SHA-256: b6762906ec5bba87c1d967f8eafc8762e1af63b65b7c16265028daafa3e4f1e0
font_01_sfnt_off00007cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDE 11052 bytes
SHA-256: 22377c2069719ad95c74e66e1809ec51e1fe51848ed190363fdae587c7ddb63c

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