Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb40f7ea3df0c93…

MALICIOUS

PDF

34.0 KB Created: 2020-09-01 05:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e724c5251f05b623c9ff0a73d17050e9 SHA-1: 52971ce4c8999e4f06990d30ee3c0969fdab45c3 SHA-256: 6bb40f7ea3df0c9384979919405386aa5389217061d0f96f9cafa19954bf6037
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The heuristic PDF_SEO_LINK_FARM suggests the document is part of a larger link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier strongly indicates maliciousness, and the embedded URL is the primary indicator of compromise.

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.cc/wix?keyword=arris+modem+sb6141+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/804ff6_037f5e0072e04291b50e82d099029fd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_8721ec39ed8242659ef8b3856c7e077f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7d901285f5b407ca264dc20b77830cf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6150/0309/files/gexoximiteluxojavop.pdf
    • https://cdn.shopify.com/s/files/1/0434/5361/2199/files/kesujuwuvebodoxati.pdf
    • https://cdn.shopify.com/s/files/1/0434/6832/5029/files/13194900430.pdf
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/2016_gsxr_750.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/mailchimp_button_modal_popup.pdf
    • https://cdn.shopify.com/s/files/1/0433/7224/9251/files/blog_post_template.pdf
    • https://cdn.shopify.com/s/files/1/0461/9121/4743/files/75440334950.pdf
    • https://cdn.shopify.com/s/files/1/0429/0510/8636/files/digezisojazoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2335/8358/files/navy_blue_platform_heels_with_ankle_strap.pdf
    • https://static.usrfiles.com/ugd/50c35f_273503691496489a830d55599ea934c8.pdf
    • https://static.usrfiles.com/ugd/191a6d_773c73ee468447ceb9048532e628fa3b.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_7ab7f62381f04ea8893a38f7f11f65c1.pdf
    • https://static.usrfiles.com/ugd/74a852_7bd78d7831c447dd847e15702869af83.pdf
    • https://static.usrfiles.com/ugd/defcb2_ec910077c12046cf98a15715c4124490.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_off000047e1.bin
c1f203c4cfa50540f4d7a26ca601e03d2361cd418b60f0445984165d47b1e821		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47E1 5396 bytes
font_01_sfnt_off00005a22.bin
e6594f92f1fa0343a57d36591c5f6693b876e1e5612f1a4d8932138d60c39215		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A22 9700 bytes

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