Malicious PDF — malware analysis report

Static analysis result for SHA-256 d367ec4cb7840f46…

MALICIOUS

PDF

39.5 KB Created: 2020-11-07 22:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5023b700a795e90c64449862295a179b SHA-1: 41b94a91f3090330cbd393e9d3a76dade97e015a SHA-256: d367ec4cb7840f46a7907477337aaab7cffd2ed4ab2defa016abfe25edf8e4b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to link farms and redirectors, indicating a malicious intent to lure users to potentially harmful sites. The heuristic firings confirm the presence of malicious redirector links and a link farm structure within the PDF. The document body, though partially corrupted, contains the URL https://traffmen.ru/123?keyword=final+fantasy+15+pdf+strategy+guide+download, which is flagged as a known malicious redirector.

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://traffmen.ru/123?keyword=final+fantasy+15+pdf+strategy+guide+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5f9425203c435.pdfIn PDF document text
    • https://tiferivirukituk.weebly.com/uploads/1/3/4/4/134433041/20b36fd55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_5f9f2fa9e1c82.pdfIn PDF document text
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/losemibinum.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/8286b3e2e4d.pdfIn PDF document text
    • https://lajanasana.weebly.com/uploads/1/3/4/3/134368101/4625478.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/64874228532.pdfIn PDF document text
    • https://tuxabavijig.files.wordpress.com/2020/11/37940387668.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/exponent_power_rule_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc969c5-b429-4e93-b539-062097af6601/39923256690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb39f09-097b-4746-b61a-9c348c863e3a/84712390388.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/16231116898.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/merozasopegujibe.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/leimadophis_epinephelus_common_name.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/66557105943.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/of_monsters_and_men_crystals_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/11823325890.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_off00005769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5769 5536 bytes
SHA-256: 9b253908c66ee5c26226cb21629ba6a0f820b8b386d3a5c8dcb8200d33f61ad1
font_01_sfnt_off00006a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6F 11700 bytes
SHA-256: ff9776729667857a8ccca2a2a233aa6e5ad3131c16e8755b0f8cc9e083277d0b

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