Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb919e69143cc29…

MALICIOUS

PDF

43.6 KB Created: 2020-10-30 03:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f7c6d3c3974f8529ae955a4716fbd79 SHA-1: 9e6cb96e3f952571b91a0f84d8e07adb0e7dff1c SHA-256: 3fb919e69143cc29d0c35e9e0094a8aa88993416557a82b2c23c3ebffb64fb3d
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://ggtraff.ru/strik?keyword=linksys+wireless+g+usb+network+adapter
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5f95499f18e7d.pdf
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/fewukodifimuraresafo.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/7989682.pdf
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5f8b3e7f74841.pdf
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/7296510.pdf
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/9591872.pdf
    • https://galavalo.weebly.com/uploads/1/3/4/4/134464717/rosibazavi_jatunopabez.pdf
    • https://devuzagobeli.weebly.com/uploads/1/3/4/4/134431767/fosomifidisib.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tugunari_fogeze_nezejavoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0501/6571/1009/files/64448675317.pdf
    • https://cdn.shopify.com/s/files/1/0467/5695/4275/files/6368129664.pdf
    • https://cdn.shopify.com/s/files/1/0430/4846/8631/files/science_worksheet_for_grade_3_icse.pdf
    • https://s3.amazonaws.com/henghuili-files/kapimiperitodidixef.pdf
    • https://cdn.shopify.com/s/files/1/0501/6564/5473/files/ncaa_basketball_statistics_manual.pdf
    • https://s3.amazonaws.com/jeworurowam/calendario_calcio_serie_b.pdf
    • https://s3.amazonaws.com/kitakilesa/1999515245.pdf
    • https://cdn.shopify.com/s/files/1/0505/1626/3083/files/rojetinakekizefilutog.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b5f.bin
e3179a48f5487cc69effb1058baf2e46f0ecc7f61e692cddfd5a8d9b85587dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5F 5464 bytes
font_01_sfnt_off00007e1a.bin
14657d6e0ec845aef87ce25a42ba20bbeb572940ca9a624facdfc4c96b379709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1A 10384 bytes

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