Malicious PDF — malware analysis report

Static analysis result for SHA-256 6777399a989e2130…

MALICIOUS

PDF

45.6 KB Created: 2020-05-19 17:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 699c9e3999096d921a8eee1febd06c53 SHA-1: 5a26c144ea64b3a71b5d33f42cbb57e72fc55ec4 SHA-256: 6777399a989e21309c4802862ff1e7ffb3779fb11accf55e59e189067f3b957f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to various domains, many of which appear to be part of a link farm. The ML classifier strongly indicates maliciousness, and the PDF_RANDOM_URL_LINK heuristic points to a specific suspicious URL. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://wfgrainmakers.net/uploads/1/3/0/5/130588784/130588784.html#metodo+hamburgues+de+calculo+de+juro
    • http://cedarsoulfeather.com/uploads/1/3/0/4/130483390/sufajagajulega-gararefed.pdf
    • http://knead-massage.services/uploads/1/3/1/0/131070490/buvaketeb.pdf
    • http://otcia.com/uploads/1/3/0/6/130604359/9052224.pdf
    • http://societysforgottenchildren.com/uploads/1/3/0/7/130739152/zofujiderowumew_vuvon_xedogox_regujufomapugo.pdf
    • http://clochconcrete.com/uploads/1/3/1/1/131163763/fc0f7.pdf
    • http://alternativehmg.com/uploads/1/3/0/5/130550873/tupenigilugaje.pdf
    • http://sharpcollarmate.net/uploads/1/3/0/6/130620823/tekufezezalipu.pdf
    • http://otlc.nl/uploads/1/3/1/3/131379402/kuvaga-nabobu.pdf
    • http://thecinart.com/uploads/1/3/0/7/130776061/3841130.pdf
    • http://nhanquamomo.online/uploads/1/3/0/4/130488513/1c8171e.pdf
    • http://breezyridgedirtworks.com/uploads/1/3/0/6/130639107/majeruvazugedid-voxujuk.pdf
    • http://blueshadowoperatorinvestigations.com/uploads/1/3/1/3/131379443/b317c974eb.pdf
    • http://skitterly.com/uploads/1/3/0/6/130639408/puwurub.pdf
    • http://beaufortcountyregister.com/uploads/1/3/0/7/130776872/vinujaxubi.pdf
    • http://thehomeboysreno.com/uploads/1/3/1/4/131482886/145d22721e41b1.pdf
    • http://k2rcleaning.net/uploads/1/3/0/6/130604182/wajodosatu.pdf
    • http://my2handsstudio.com/uploads/1/3/0/3/130379110/4588385.pdf
    • http://vallesia.ch/uploads/1/3/0/7/130738684/tibelavit.pdf
    • http://80frankstreet.com/uploads/1/3/0/5/130590656/jisufadejapife_diwabejegixufi.pdf
    • http://bodymadefit.com/uploads/1/3/0/7/130739348/vusumut.pdf
    • http://vglessons.com/uploads/1/3/0/2/130289254/95a01ea8fb6ee.pdf
    • http://ciceropublishingllc.com/uploads/1/3/0/6/130621751/6259358.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ee6.bin
de3e7985778f298033245bee1831817cb22786a6c4d1f3876136e9ba772f457e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE6 14600 bytes

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