Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fc84fd0861bc04…

MALICIOUS

PDF

52.4 KB Created: 2020-11-08 12:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fd619db7b9522c136c13fd4b34d3ace SHA-1: 936418273d6ec99f93f198996e36a66353c0734b SHA-256: 55fc84fd0861bc048173f3cad308b478240b2850582d94a95ef2a02fdf244ffc
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'free john deere lt155 manual pdf'. The PDF_SEO_LINK_FARM heuristic further suggests a large number of outbound links, likely for SEO manipulation or to distribute malicious content. No scripts were extracted, but the presence of malicious links points to a phishing or redirection attack.

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/123?keyword=free+john+deere+lt155+manual+pdf
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/fevov.pdf
    • https://bakurisevujukuj.weebly.com/uploads/1/3/4/3/134368754/050df.pdf
    • https://defutijobazaso.weebly.com/uploads/1/3/4/5/134587482/nesurowob.pdf
    • https://rubovumalez.weebly.com/uploads/1/3/4/4/134458479/9034679.pdf
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/5229935.pdf
    • https://bufasadapigeze.weebly.com/uploads/1/3/4/3/134307931/sorebi.pdf
    • https://wofinomedek.weebly.com/uploads/1/3/4/1/134108675/nezos.pdf
    • https://cdn-cms.f-static.net/uploads/4418991/normal_5f95f7ab3706f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/86425c42-07c1-465a-85e4-e45c5f171f18/7540548731.pdf
    • https://suvarofora.files.wordpress.com/2020/11/lodebukiworidu.pdf
    • https://lalibakorex.files.wordpress.com/2020/11/66543182836.pdf
    • https://vadazigifexe.files.wordpress.com/2020/11/merozasopegujibe.pdf
    • https://uploads.strikinglycdn.com/files/5e42bb24-7d56-4851-a6c8-fbe0981207f6/free_robux_generator_no_survey_no_download_no_human_verification_no_password.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008304.bin
23c356062f152e79208c9cc7e875e37dbd874f0064f8193231d33c5177ec0c63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8304 5308 bytes
font_01_sfnt_off000094f1.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94F1 3720 bytes
font_02_sfnt_off0000a054.bin
eebdc5b969c045481eccc47c4c235b13316d40e03e2d971e8ca07173ced3bb16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA054 10852 bytes

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