Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef5f8d67738618d…

MALICIOUS

PDF

57.3 KB Created: 2020-08-21 03:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcf3ad4e3702753e411f47463296c28d SHA-1: a850da6d7a03db60deb2796db530a94e635cc330 SHA-256: 5ef5f8d67738618da97dd4f8956113f7727277cc4a46a8926d05cf1a7d9a341f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users into clicking these links, potentially leading to phishing sites or malware downloads.

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.com/pify?keyword=errata+sheet+sample+form
    • http://files.artbylatiolais.com/uploads/1/3/0/8/130813934/zutivazemedego_noxorelevawipon_raxevatud_zigemopol.pdf
    • http://files.healthybitezkosher.com/uploads/1/3/0/7/130739651/ligusoremovevodo.pdf
    • http://doluxum.lakeriley.org/uploads/1/3/1/1/131163857/3148768.pdf
    • http://lareko.classicfilmworks.com/uploads/1/3/0/7/130774981/tegugumino.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2778/3080/files/nelikurusepapedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3171/5225/files/perizos.pdf
    • https://cdn.shopify.com/s/files/1/0438/1684/5469/files/54561188887.pdf
    • https://cdn.shopify.com/s/files/1/0432/8515/1910/files/83569508756.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/86955565174.pdf
    • https://cdn.shopify.com/s/files/1/0433/7375/6572/files/adjective_worksheets_for_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/cell_city_analogy.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/seziborovexezowov.pdf
    • https://cdn.shopify.com/s/files/1/0452/3904/2205/files/sofibinupeti.pdf
    • https://cdn.shopify.com/s/files/1/0436/6758/7225/files/generator_and_alternator.pdf
    • https://cdn.shopify.com/s/files/1/0447/0652/9434/files/british_vs_american_english_spelling.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/5308407949.pdf
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/ms_aphasia_screening_test.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_off0000a013.bin
15f7f44f1e2ec23dbfb28dd921fcc75b5cc6d0beb728a9c0241d5a5024abb47a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA013 5100 bytes
font_01_sfnt_off0000b147.bin
399c5057461536169507f153a50b556f610304c975ecdcd35acc377dc97c17e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 12308 bytes

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