Malicious PDF — malware analysis report

Static analysis result for SHA-256 40dc9fd2afc6375d…

MALICIOUS

PDF

34.5 KB Created: 2020-11-07 15:25:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c947bf137d22c5d83480341d7f19c4da SHA-1: fa7ab0d1de85a46b13c8011d0fcfb9a438e5a986 SHA-256: 40dc9fd2afc6375d3fd526d39342280fbbcc4530e8402d08a6711a6159e63807
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM. The primary URL, https://ggtraff.ru/wb?keyword=5th%20grade%20ela%20pacing%20guide, is identified as a malicious redirector. The document body, though partially corrupted, contains similar text, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious.

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.
  • 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/wb?keyword=5th%20grade%20ela%20pacing%20guide In PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/251edb27656b61.pdfIn PDF document text
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/ruwivubimofad-jutasud-gufetiwodov.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/widafibit.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/suzitivasekoga/2006_nissan_350z_repair_manual.pdfIn PDF document text
    • https://daxazepuj.files.wordpress.com/2020/11/70991830614.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/verusejijosajufomeguw.pdfIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdfIn PDF document text
    • https://xajawut.files.wordpress.com/2020/11/baidyanath_ayurvedic_medicine_price_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092f3f02-91ac-44b1-8512-40a90caedf49/62936907592.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_off00004b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B2C 5188 bytes
SHA-256: 2613617a941e0a6bc97d45542d16ede433b89fe810c8665de69a8c955386b96b
font_01_sfnt_off00005cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCA 9744 bytes
SHA-256: 9d467731ad60c2ba409771377f1d79b28ecc531adc8ee290a7ad141921dd1e6d

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