Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba913d8d26532257…

MALICIOUS

PDF

51.7 KB Created: 2020-10-15 00:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0ed781a3ff9dd465cb8763948650d6da SHA-1: 31556d8f1cb57138392bc703e6b2dfa262fb12ea SHA-256: ba913d8d26532257fb5641dcc96e1decbce29b116c47006749057d22392849f9
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/pify?keyword=law+of+multiple+proportions+worksheet+doc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f876ef623fc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f87119b2c630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8737b4d6d7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f876dc6d41a8.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/76c30d49.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/2642225.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/zutilipevozafeguwu.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/a868c.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/duzebajonufepunurudu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8679/9541/files/earth_science_final_exam_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1035/7913/files/83118237565.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1594/5890/files/pink_floyd_piper_at_the_gates_of_dawn_tracklist.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2846/2243/files/jezosofinukuzamubuxudife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9168/8610/files/august_from_wonder_face.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5875/7277/files/middle_park_high_school_football.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6737 5372 bytes
SHA-256: f3fb3edf4ba3d2ace92eaf3b87b1e45da34d0891d11297e7467bf2431b7f0cbb
font_01_sfnt_off00007960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7960 10344 bytes
SHA-256: c52e19423aad3e7f8f64b0309c7bb6e0a0a48374e3d8278adf5777d9a8a10ff0
font_02_sfnt_off00009d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0F 16316 bytes
SHA-256: 88c5b3c51c9acd4032463f9d85be4e4d95233c1825d2a25d04e7966e13c35e81
font_03_sfnt_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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