Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2bf56787d2e127…

MALICIOUS

PDF

44.8 KB Created: 2020-08-08 11:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b829f27f8a77e4faaf05d630cff1607 SHA-1: a321ad81501159028d41a3bec92150dab73115be SHA-256: 5f2bf56787d2e1273fcd915ace598e3b4781a771d80b512799b3074216bc235f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to a redirector service. The document body text, though garbled, includes the URL for the redirector and several Shopify-hosted PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms the intent to lead users to harmful content.

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://ttraff.ru/pify?keyword=probability+sampling+in+quantitative+research+pdf
    • http://files.nationalroadchurchofchrist.org/uploads/1/3/1/4/131406520/a0813.pdf
    • http://files.harrishomeopathy.com/uploads/1/3/2/6/132695633/46d872b50395702.pdf
    • http://files.mrsnelsonrocks.com/uploads/1/3/1/4/131452878/sewirakegi.pdf
    • http://bemugup.whispergathering.com/uploads/1/3/1/0/131070420/zesurevetaju_kofuzewebusavi_zevazagixabanif_gojarejuton.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6125/6096/files/najemekiza.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/77159874828.pdf
    • https://cdn.shopify.com/s/files/1/0447/0479/2729/files/catalogo_cklass_primavera_verano_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/89074212420.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/mutoliwapiweruju.pdf
    • https://cdn.shopify.com/s/files/1/0433/9059/9319/files/38663691973.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/street_address_in_usa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1236/files/25712589924.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/jevubirebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6938/files/demosijanovege.pdf
    • https://cdn.shopify.com/s/files/1/0431/1760/9122/files/wikabebarawidarigaroda.pdf
    • https://cdn.shopify.com/s/files/1/0428/3174/1095/files/69986508392.pdf
    • https://cdn.shopify.com/s/files/1/0438/4718/8640/files/gulomutisekuzisisa.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_off00006f1e.bin
faac5277d59150662558b508db54cf54e791e51512db50f487998f15a9e2158b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1E 5996 bytes
font_01_sfnt_off00008364.bin
651a868f663162befb56c7461288d3353701bb438a53bb63d09ff361978d0dbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8364 10068 bytes

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