Malicious PDF — malware analysis report

Static analysis result for SHA-256 3810a5ba1eab39cd…

MALICIOUS

PDF

32.0 KB Created: 2020-06-05 22:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10f222ad75e85a1b7b666e0c0b07437d SHA-1: f373a8b109cead5a0fac2e6a73823503c1ba333a SHA-256: 3810a5ba1eab39cdd82b0571cc36de6b290f28fb1c3fbc7ef285289707ad5b7c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, many of which point to domains designed to appear as legitimate content hosting sites but are likely used for malicious purposes. The document body text, though garbled, contains a reference to 'Ring of elysium won't launch', suggesting a lure to trick users into clicking the embedded links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mta-sts.starfireband.ca/uploads/1/3/1/6/131607103/131607103.html#ring+of+elysium+won%2527+t+launch
    • http://badbehaviorrp.com/uploads/1/3/0/7/130739791/4289b.pdf
    • http://fredstrebeigh.com/uploads/1/3/0/6/130639183/2860694.pdf
    • http://chronicwellnessexperts.org/uploads/1/3/1/3/131398260/dinatidepiwuf.pdf
    • http://8b.undesirable.us/uploads/1/3/1/3/131384559/9502245.pdf
    • http://mta-sts.starfireband.ca/uploads/1/3/1/6/131607103/terms.html
    • http://mta-sts.starfireband.ca/uploads/1/3/1/6/131607103/dmca.html
    • http://mta-sts.starfireband.ca/uploads/1/3/1/6/131607103/policy.html
    • https://zadidepetox.files.wordpress.com/2020/06/73035912989.pdf
    • https://wigasoxela.files.wordpress.com/2020/06/litujogufegoduvo.pdf
    • https://fasefusal.files.wordpress.com/2020/06/suzelalered.pdf
    • https://dipirikufuda.files.wordpress.com/2020/06/nujujubagugazaz.pdf
    • https://sazojefos.files.wordpress.com/2020/06/51544584690.pdf
    • https://juderoxer.files.wordpress.com/2020/06/wunex.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_off00004fd9.bin
832fac2c52f9520ee8af9af4e69526fde84d0760ffb9e1fab5d0fe9a7e36faf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD9 10724 bytes

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