Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad65fc9b48c8a0a…

MALICIOUS

PDF

37.1 KB Created: 2020-08-28 21:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f977f5368c46ec4a37d8bb3b1bc8a20f SHA-1: c4e07ea02e778c273b55b713dfb5922241d80e34 SHA-256: 3ad65fc9b48c8a0aaf0abb6d7046df1c5c53e05755a5527d414e90baa6173393
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on CDNs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/wix?keyword=sankarabharanam+song+mp3+download`. The document body, though heavily corrupted, contains text related to song downloads, reinforcing the lure. The ML classifier 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.cc/wix?keyword=sankarabharanam+song+mp3+download
    • https://static.usrfiles.com/ugd/b8c837_79014978337143ef8aa256f3ebac420b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c74b6e8cdf3a433ab4f3a95ebcaffb3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_85196644eabb4488bdd8950c3fdd374f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2221e226f0e647fa94630d322fa78eca.pdf
    • https://cdn.shopify.com/s/files/1/0437/6064/8343/files/98399519029.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/vofoveletagikabumawodab.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/13644077648.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1562/files/bogavefasepu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/97751458566.pdf
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/pozofapevamadutitaju.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_off000049ef.bin
03b4327958e45a24463df4a801a9905945b4a1e32e7c7712b3c82a60115cf3d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49EF 5936 bytes
font_01_sfnt_off00005dfb.bin
27a4f9b1281b9ecb9eb3abb5e33e92690ac8dd5abbdd69e72512c91869ed6b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFB 13448 bytes

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