Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc4cfaf1dbca927…

MALICIOUS

PDF

35.6 KB Created: 2020-08-30 01:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c50be69e7bc9d69b3d1c5d35a83008c1 SHA-1: a5726b1c397a6b7db90607fc0ef7f8bfd2921be7 SHA-256: 8dc4cfaf1dbca92766ce898317d9aa64df91e06dc8907ef00eba46b3b4114029
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/wix?keyword=universal+kathisma+church+songs', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and a large list of other PDF links, suggesting a link farm or redirection scheme designed to lure 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=universal+kathisma+church+songs
    • https://static.usrfiles.com/ugd/b8c837_7649132ef5904122b1299c1e52f472a3.pdf
    • https://static.usrfiles.com/ugd/299074_53a59b53ad4a4221b8c889cfc5f45050.pdf
    • https://static.usrfiles.com/ugd/3b0c81_0242e7925c004184a3897c10aefb6002.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/37737953432.pdf
    • https://static.usrfiles.com/ugd/af0aa9_3c3e1300de9441c8b939eb3a0f6cb862.pdf
    • https://static.usrfiles.com/ugd/9219f8_227a670623834935bf86822260bdf456.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/vimafoditugejof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6951/3632/files/monulalu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/nitimidototoronanexe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/b_tech_malayalam_movie_dvdwap.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_off00004d4d.bin
f534dcb32e2280f47c4c9e45341975db28fa9ffab295e65c3c68645643b79f57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D4D 5328 bytes
font_01_sfnt_off00005f45.bin
b8c3a3248cbc6ab6dcfe06de2772cc26fdac48b9d87b3d66e6790cb3cf17a760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F45 10132 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.