Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a856408f9a4544…

MALICIOUS

PDF

44.5 KB Created: 2020-10-28 21:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cd5e7ab27d6ae16b898950d055e45eb SHA-1: ed490f520e1737d497b5227b86c7aa5c16ef3a57 SHA-256: b9a856408f9a4544f563bb1f2975687e418e0cfb6dee7d23568ba0bad28fccd1
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector URL, suggesting an attempt to direct users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the primary malicious URL and other links that appear to be part of a link farm, likely for SEO manipulation or to disguise the malicious redirect.

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://cctraff.ru/aws?keyword=clinical+pharmacology+for+prescribing+pdf+notes
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/7153082.pdf
    • https://refaxezadale.weebly.com/uploads/1/3/4/3/134325555/5138223.pdf
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f90db523791e.pdf
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f95f9ecb88ce.pdf
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/584538.pdf
    • https://dosedoduni.weebly.com/uploads/1/3/4/3/134347632/5028047.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0486/1739/0245/files/watauga_county_schools_nc_jobs.pdf
    • https://uploads.strikinglycdn.com/files/af6a7f8b-47ef-4d12-9e56-2f8fd71c97a5/79019172987.pdf
    • https://uploads.strikinglycdn.com/files/7da9c3a6-38c6-4496-9309-2fe93fc2129b/rutina_trx_full_body.pdf
    • https://s3.amazonaws.com/votubukaxogilix/atividades_educao_infantil_3_anos.pdf
    • https://s3.amazonaws.com/paropabaru/58157518500.pdf
    • https://cdn.shopify.com/s/files/1/0481/8717/9160/files/94059178086.pdf
    • https://cdn.shopify.com/s/files/1/0482/6808/3358/files/30228303509.pdf
    • https://uploads.strikinglycdn.com/files/90e24f2b-0fef-4ead-b118-8b82e606f4ba/bisiw.pdf
    • https://uploads.strikinglycdn.com/files/32ba5634-50bd-4efe-a7d5-8a85451ec43e/tezazakotepodoko.pdf
    • https://uploads.strikinglycdn.com/files/ac38a61e-c914-4128-b7e2-0a317563e0ce/jutuba.pdf
    • https://s3.amazonaws.com/xanebavifamopez/8270284718.pdf
    • https://s3.amazonaws.com/pazifetanegapu/deketeso.pdf
    • https://uploads.strikinglycdn.com/files/215e3c1f-7092-414b-9149-d746c40db7e7/n_thng_nhn_chu_doanh_wiki.pdf
    • https://cdn.shopify.com/s/files/1/0508/3424/3749/files/dinoruxidelilonajojoj.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_off00006cbd.bin
b5e30d366dd431112ce16cdb9294c31fbbbbe3a0615530497e225057e81e8e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBD 5716 bytes
font_01_sfnt_off00008002.bin
6825c726fea0589336a36fdf5fe7784889c541bc3b7c305e070d4c0692dc6a55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8002 11208 bytes

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