Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6bf35a51ce62da…

MALICIOUS

PDF

64.4 KB Created: 2020-08-31 10:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9b3c204fad0b75be0d12110e43c2ab6 SHA-1: a3c0ae24c5261313b69f6f000974a134ad76ccce SHA-256: 6c6bf35a51ce62da94016f24b58e5413e9a8a284f1913a018246229d644f75a5
194 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains text fragments and URLs consistent with an advance-fee scam, specifically a lottery or prize lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.cc/wix?keyword=how+a+realist+hero+rebuilt+the+kingd
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/173616_3436dae0668f4ace9ef14afd52e19475.pdf
    • https://static.usrfiles.com/ugd/6924eb_dbfc3ad7aa5843b9bedb66384baf3252.pdf
    • https://static.usrfiles.com/ugd/82e28d_3594b35d85ab47958303d1851b6a638f.pdf
    • https://static.usrfiles.com/ugd/0c268c_4446dfe111c143a9a32140bbcc06c5ce.pdf
    • https://static.usrfiles.com/ugd/83d902_25d5e75578884191ae2a3637aea67203.pdf
    • https://static.usrfiles.com/ugd/b8c837_67e7acd4ca64447d8afb699521dc813a.pdf
    • https://static.usrfiles.com/ugd/72b0e7_1b7bfaae23df4d50aebd8581dc2a9062.pdf
    • https://cdn.shopify.com/s/files/1/0435/8212/8291/files/40310503923.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/25374154057.pdf
    • https://static.usrfiles.com/ugd/6d59ab_3f9b5085f246448eba8d535a39da86bb.pdf
    • https://static.usrfiles.com/ugd/44b221_a356875363074b05931f88c4c36c74d0.pdf
    • https://static.usrfiles.com/ugd/cf14a4_0e089d1c34834b4d8de42d7cc6cafa97.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c6e.bin
192221a421c07067f9b643d17a190997a4f623958d691c96a0f280ae65a7cd6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6E 15732 bytes
font_01_sfnt_off0000bd52.bin
8bcf635e056ec2beefdb75f254078a7dd0c1f47c51d326fc386d0808e6bb07e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD52 5344 bytes
font_02_sfnt_off0000cf82.bin
1e3d0f002d046d139a61184a043546d6a0d6a975b426ca61eefc3925e87a046e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 10320 bytes

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