Malicious PDF — malware analysis report

Static analysis result for SHA-256 663bb37d5bd49fdc…

MALICIOUS

PDF

40.2 KB Created: 2020-08-31 05:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dc2c24d8db9b09a8a1e7b6814c07c5b SHA-1: e20e540f11b5e88a45262d2e72758ef80c8653b8 SHA-256: 663bb37d5bd49fdc592f2214db96d629156ac480ccf130410be441dae68d55b8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with the primary one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for a "Buell owners manual pdf". The presence of a link farm and a critical heuristic firing for malicious redirector infrastructure indicates a high likelihood of this document being used for phishing or malware distribution.

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.ru/wix?keyword=buell+owners+manual+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_a8ad3ecf65584627bc5e3562a191cc8c.pdf
    • https://static.usrfiles.com/ugd/9421c8_5799d64d0f574468801c12e2baeee0aa.pdf
    • https://static.usrfiles.com/ugd/930050_6baddd03a27d43c9bff7c18d22a80edc.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/zediguxobumagirumem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83260340608.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6527/files/80882841644.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0512/files/bolivomipuvitefobu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1569/1678/files/fugasuvilusugomuwejegamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6846/files/relexas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96989945255.pdf
    • https://cdn.shopify.com/s/files/1/0440/6837/2632/files/kaplan_gre_math_workbook.pdf
    • https://static.usrfiles.com/ugd/5ecadc_a5cbd4e23f574cbbbdf4dc1e36ae1506.pdf
    • https://static.usrfiles.com/ugd/b8c837_8133846a74a347bb80fdd642ef36c006.pdf
    • https://static.usrfiles.com/ugd/e6092c_d7f47b9713b14ee59f33e95aa5325d1d.pdf
    • https://static.usrfiles.com/ugd/12daa7_a7692fe307924c30ab282db339dcb37a.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_off0000531d.bin
53829794a8b7e5c3a62a3f1c57ceb2184a98d9673400365f09796fc6f05452ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x531D 5084 bytes
font_01_sfnt_off00006452.bin
a202600ca290bfde43b7a80e33a82429dba0942724fb9915841b7e2653a3116b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6452 9868 bytes
font_02_sfnt_off00008606.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8606 4324 bytes

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