Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ad7789d036d827…

MALICIOUS

PDF

40.6 KB Created: 2020-04-08 15:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f8ee27749fbbdc8f0f404f8b20c918ef SHA-1: 7865d97b6434160a14be9f33f9a832df1b6a3233 SHA-256: a4ad7789d036d82706272b161f1461c86fcf878c30b6d0a279f9be1b6b134502
94 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing a large number of external URIs pointing to various domains. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a multitude of PDF files hosted on unrelated domains, likely for SEO manipulation or to serve as a distribution point for further malicious activities. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://andersonbikes.com/uploads/1/3/0/3/130323302/130323302.html#growth+mindset+worksheets+for+adults
    • http://myadventuresandlifeonflm.com/uploads/1/3/1/3/131398576/5619080.pdf
    • http://bulletinsusa.com/uploads/1/3/0/6/130620691/9476181.pdf
    • http://jsrhomeservice.com/uploads/1/3/1/3/131379685/7613150.pdf
    • http://cameronbertrandvip.org/uploads/1/3/0/2/130291527/bomadaku.pdf
    • http://lowelldavies.com/uploads/1/3/1/3/131379532/sojamorused-woxopoxusat.pdf
    • http://bweguild.com/uploads/1/3/0/6/130639929/datomotomawilutubi.pdf
    • http://flowerssensationsbyeyleen.com/uploads/1/3/0/2/130271076/bevove-piwozegexa-neresonemo.pdf
    • http://graveyardproductioncompany.com/uploads/1/3/0/5/130589209/dupolozepo_vesijogup_wovud.pdf
    • http://sbzdel.com/uploads/1/3/0/6/130620803/jisikedur-tezipaguxuduwa.pdf
    • http://blackbindi.xyz/uploads/1/3/0/4/130489437/4438277.pdf
    • http://ruksookapap.com/uploads/1/3/0/7/130775025/fokojoxivudofe.pdf
    • http://charlieproof.com/uploads/1/3/1/4/131436967/kixifatexitib.pdf
    • http://beentheretravelreviews.com/uploads/1/3/0/3/130379151/415960.pdf
    • http://torontoipoffice.com/uploads/1/3/0/2/130291707/e6bb54c.pdf
    • http://smayerlegal.com/uploads/1/3/1/3/131382320/1049859.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007682.bin
640c8d9bb29d99efaff839024d90116c4fb368999cbb0af7404b84e31c4283ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7682 7880 bytes

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