Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40d16b6548dc081…

MALICIOUS

PDF

43.1 KB Created: 2020-09-08 23:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a945471098f2d11d812fc458c4432051 SHA-1: 36026fbeed2a7506dd5b9af745c3de9b2a4b937b SHA-256: a40d16b6548dc0818fb981e4f09c42a1df56c2dbd497a201b05fc39709003b41
150 Risk Score

Malware Insights

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

The PDF document is designed to appear as a lure for 'free cad dwg files'. It contains numerous embedded URLs, with one identified as a malicious redirector. The primary malicious URL is https://ttraff.link/wix?keyword=free++cad+dwg+files, which likely leads to further malicious content. The document body, though partially corrupted, contains text related to free CAD files and the URLs themselves.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.link/wix?keyword=free++cad+dwg+files
    • https://static.usrfiles.com/ugd/271e65_43b24f3b561e4a6dbeaed5fa7bed8b59.pdf
    • https://static.usrfiles.com/ugd/564d2e_ba48081ff94e4de7abfa21bf4e06e06b.pdf
    • https://static.usrfiles.com/ugd/ed64d2_dfd02a0162734430841e66f8da464dd4.pdf
    • https://static.usrfiles.com/ugd/61f964_d57e335c1c274ce880aafe0bf1a3325b.pdf
    • https://static.usrfiles.com/ugd/822ecd_1e538937313f4a9cab26e617d92ae49d.pdf
    • https://static.usrfiles.com/ugd/4f92c1_3a20873203b14717be5463253a35c660.pdf
    • https://static.usrfiles.com/ugd/97493d_b76bd3566b544a29a671ea4f8e6220fc.pdf
    • https://static.usrfiles.com/ugd/784815_10896997db384fa9b8a0b06ba26e7277.pdf
    • https://static.usrfiles.com/ugd/510691_bddb66a7191d455cabf69c7d7592dfdd.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/mokowexu.pdf
    • https://cdn.shopify.com/s/files/1/0464/2494/8888/files/jokakesiwiwajugowowap.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/85343789421.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/serifowe.pdf
    • https://cdn.shopify.com/s/files/1/0434/9142/6469/files/57685030431.pdf
    • https://cdn.shopify.com/s/files/1/0439/6577/6030/files/ditazud.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/the_smallest_dragonboy.pdf
    • https://cdn.shopify.com/s/files/1/0436/9901/1738/files/parimowotonuwapigojidavo.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_off00006894.bin
0e73f0f217f33206a550c8739de0017cdfb7a00594825f84a23e666c31c71359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6894 5236 bytes
font_01_sfnt_off00007a8c.bin
413d4f66481009f19c850fb27471e319c99a214a34c5b9de3e97cdc94d7e2ca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8C 10940 bytes

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