Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1b5c0356dee30a…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 08:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b5a0edd572ac0b59f4edddb1c1dcd3 SHA-1: 23eeafec75a5604cbfe2051aa4129a324ce39bf5 SHA-256: 7e1b5c0356dee30aae99f00450aafad53bbf9a8bed565212a114ca137ad31027
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. The document body, though heavily obfuscated, contains the malicious URL and appears to be disguised as a checklist.

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://ttraff.com/wix?keyword=beechcraft+debonair+checklist
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/83b1b3_5db8d05265e84794a2e3596570a135b9.pdf
    • https://static.usrfiles.com/ugd/8e1900_a6fecec489bf488d92c1495691065124.pdf
    • https://static.usrfiles.com/ugd/26938b_47b2fa9240624b67b3365b4e279a165b.pdf
    • https://static.usrfiles.com/ugd/b8c837_12f9d3d6161947c6aca4565ed9c2ee0d.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/nedurili.pdf
    • https://cdn.shopify.com/s/files/1/0433/6405/7247/files/36803092452.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/badekogagoriravej.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/tededuf.pdf
    • https://static.usrfiles.com/ugd/b8c837_3694562c2f81490580e07062b122b439.pdf
    • https://static.usrfiles.com/ugd/fd3290_58518253360946549db8a6b9a29fbd29.pdf
    • https://cdn.shopify.com/s/files/1/0429/3482/9223/files/givafofojaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8083/files/albert_schweitzer_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/2000/1178/files/nodozagedoxojoguwav.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061c3.bin
57fb95d7f40be92f065f9214657b42faf8b3a41c8e926fa56ca0bad9731e2f78
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C3 5364 bytes
font_01_sfnt_off000073ee.bin
d8d56dd10646a4bf95a650c41231ed35a327b50189a9586d2f62b2fcd700930f
pdf-font-stream PDF embedded font (sfnt) at offset 0x73EE 10212 bytes