Malicious PDF — malware analysis report

Static analysis result for SHA-256 08eb374d512e62c1…

MALICIOUS

PDF

48.1 KB Created: 2020-09-01 13:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc1263a815c29fc1ab3c2826b7c1a27a SHA-1: c5fd682ecdf8e253b15519448d5b04306ef9e6b3 SHA-256: 08eb374d512e62c172c33a0ed1cddbdb09a1795036d333b176a61a7ae34bc79f
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, specifically a URL associated with a redirector. The document body, though heavily obfuscated, contains a reference to the same malicious URL. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=airport+utility+per+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/38bf1f_1d28637270754193bc3db8e9fdc1f3b0.pdf
    • https://static.usrfiles.com/ugd/be19e1_752338f9fa7f46e1ac0496b17d0b899c.pdf
    • https://static.usrfiles.com/ugd/9a242c_38eb6606131e43f7905f9d88447ced95.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0135/files/indesign_fillable_form_template.pdf
    • https://static.usrfiles.com/ugd/857e61_1a3abc17182f4276b8af8166ad506833.pdf
    • https://static.usrfiles.com/ugd/82e28d_39903ae8bc9f48568f002b9ecf7313a3.pdf
    • https://static.usrfiles.com/ugd/f0e51d_8abf6db7136c4a35b720af30273e0b4d.pdf
    • https://static.usrfiles.com/ugd/e73fea_de9f46b1829c47b385f08579b85a5f60.pdf
    • https://static.usrfiles.com/ugd/69695d_53df80ff48234fbca0876a9d7aa35336.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6f84af0b08f4bcdb4f3f152bb374db5.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_d873f9c2144d46d5a66fd62930c7bcd3.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f19.bin
dde41624a633e6fcbd2d35be700e74f2b0e2a0592b35f2f7bddd17b3098aef87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F19 5588 bytes
font_01_sfnt_off000072a5.bin
81c18fd8fac2e7e147b008d6982f6a96995c6b06f107ad026e4dd964c9f99066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A5 4748 bytes
font_02_sfnt_off000082cd.bin
81341a4305e30349c70b40dcbc7dd6a2343c3a1df8bb1dbb456bba9dbbda5e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CD 10004 bytes
font_03_sfnt_off0000a507.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA507 4324 bytes

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