Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fb8dfc51d35809…

MALICIOUS

PDF

41.6 KB Created: 2020-08-14 13:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d50eb9f824dfba13fb0337b3d7fae179 SHA-1: 27e2af3c1256bebceccff098f3de1151f4322802 SHA-256: b5fb8dfc51d35809b963e9d9569359be75b0d0aa5524e8fce8230fd4754e5625
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://ttraff.cc/pify?keyword=comparative+of+equality+worksheet+pdf In PDF document text
    • http://files.mattblackhall.com/uploads/1/3/1/3/131382808/1426898.pdfIn PDF document text
    • http://files.endenlabs.com/uploads/1/3/0/7/130775786/bd529edea9.pdfIn PDF document text
    • http://kirozowe.confetticakeshop.com/uploads/1/3/1/3/131379992/juvosodupufobow.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/1/0430/5109/0071/files/jopuweka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4098/7543/files/vusevav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/sobazonumafarewaxagul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3649/2444/files/88158971559.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/gedotawifomaxalox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/ielts_academic_writing_task_2_vocabulary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1230/9671/files/icao_annex_10_volume_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/2678/9030/files/nenuzojavuxonisufujof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3512/2081/files/zojobira.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8325/9301/files/75302427012.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/epson_xp_620.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/types_of_cache_memory.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_off000065b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B5 5628 bytes
SHA-256: 5a0b0ce46a45de97deac15a4bdcc569781e6ad9d0f18e4fef125dfb446f9004e
font_01_sfnt_off000078c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C4 9656 bytes
SHA-256: 321b6d7e0ed4b0f307b55a2fb0abec0a8679c62ac306586ff746ff8553d700ba

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