Malicious PDF — malware analysis report

Static analysis result for SHA-256 8148eacc8a331e30…

MALICIOUS

PDF

47.4 KB Created: 2020-08-30 02:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15cdc4dce361ddff84358f303432641a SHA-1: fe2ccd0284db107191229326e909041e3b0f9654 SHA-256: 8148eacc8a331e301f565428f2ac4e61524908baa84846403fa47669c0b267fc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the malicious URL and other links that appear to be part of a link farm designed to improve search engine ranking. This suggests a tactic to lure unsuspecting users to malicious sites.

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=livros+sobre+comportamento+humano+psicologia+pdf
    • https://static.usrfiles.com/ugd/b8c837_3b11887d8f7c40c7922343d1fcf48a53.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c28141f139f4963a7afeef6ed5cd7e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_447a6753bb234add81661ee07112d95c.pdf
    • https://static.usrfiles.com/ugd/3bca44_5deef28ca2854a3d949468feafe8842a.pdf
    • https://static.usrfiles.com/ugd/ab0441_909866193c7d4c649bb2594ce469a84c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8437/files/bulimia_y_anorexia_libros.pdf
    • https://static.usrfiles.com/ugd/b8c837_e28f30ce82144481a06ca84e8cbf376e.pdf
    • https://static.usrfiles.com/ugd/9904c2_fc648f3e12824dd5a0f0058609189f44.pdf
    • https://static.usrfiles.com/ugd/b47706_4454d84189a04a9ba837a42e4a5ad887.pdf
    • https://static.usrfiles.com/ugd/b8c837_db409db4f6a241769f915350bc4ae4e7.pdf
    • https://static.usrfiles.com/ugd/9cb927_d5649b9e85e94680a21b5f7eb0572abe.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075d4.bin
b9d7aab484f715d01a26314981235661dc4352fc40335d41900dc186466c253c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D4 5708 bytes
font_01_sfnt_off00008917.bin
7c6f1b8e410e5ca995bb331cba3df5626da4c52da4a8169443ffbe4498186fc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8917 12460 bytes

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