Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51226b2f6f5b50c…

MALICIOUS

PDF

44.0 KB Created: 2020-11-04 16:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b705089adf4748e3c25a6afecca5cb3 SHA-1: c245884ee1300f06ceecdd96a1e51d0317169116 SHA-256: c51226b2f6f5b50c36392003ec95e1a08157f6ebdf2a4c4f9bcc7c2d3f9ecda2
192 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files hosted on various domains, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/aws?keyword=affidavit+in+lieu+of+originals+minor. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to these URLs, suggesting the primary purpose is to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/aws?keyword=affidavit+in+lieu+of+originals+minor In PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/debizikirapanas.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/79d32d2a1caca8d.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/5695812.pdfIn PDF document text
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/teberop_juxinid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_5f9c7a2643d82.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/fazed-tumozoxek.pdfIn PDF document text
    • https://www.in.ckgs.us/oci/index.shtml2In 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/5acbf11c-c8e4-4dd7-bed7-ba42c52eea85/bimazetegepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1087/4777/files/vebesilegufipenidufoxuso.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/ptd_2_hacked_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0636/1239/files/notalonenasomutuxediw.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_off00006b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7D 5276 bytes
SHA-256: 6d69724f3aed75a3bb0e5564b089348ef69620bd8010ce1a1bde5d5c51123e32
font_01_sfnt_off00007d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D60 11136 bytes
SHA-256: d4174ad2151f883d24ae34f6b8d48d4df23f547ad6648f47980b278e0bf5ef5c

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