Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2c6ddc5a27fcd1…

MALICIOUS

PDF

38.4 KB Created: 2020-10-03 00:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6af6689b09b7c319df0c0663f398f469 SHA-1: bfca67b1621b978fbbfcac07f78f2312a4ed37bc SHA-256: 4d2c6ddc5a27fcd1e5fd9c25c7272e9cc3ff600c4d20557ebaaff7c7aff0910f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the embedded link list, reinforcing the malicious intent. The presence of a password archive lure heuristic suggests this PDF may be a precursor to delivering a more dangerous payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?keyword=introduction+to+pragmatics+birner+pdf In PDF document text
    • https://site-1039251.mozfiles.com/files/1039251/dakagurolezuv.pdfIn PDF document text
    • https://site-1037011.mozfiles.com/files/1037011/42228870678.pdfIn PDF document text
    • https://site-1037829.mozfiles.com/files/1037829/13601711902.pdfIn PDF document text
    • http://lovuj.acorstudio.com/uploads/1/3/2/6/132696212/3366116.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/vamejepomokijalujuvumi.pdfIn PDF document text
    • https://site-1040507.mozfiles.com/files/1040507/28657973585.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/1/0429/7300/3939/files/sebipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0976/3222/files/18770185493.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3201/9097/files/gonevosu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2974/2246/files/zuwolewipojimagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/greek_to_english_translation_new_testament.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_off000057aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57AA 5520 bytes
SHA-256: ac90bd13fcd6eb08bfefb40d8f2092491c0c9975564864559a982bc538c09417
font_01_sfnt_off00006a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A51 10316 bytes
SHA-256: 594958d029b0532496333967c34bde84b811c32831ad9890ccbe07f8f8ea2e95

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