Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe4b2a80ed4489e…

MALICIOUS

PDF

38.8 KB Created: 2020-09-03 07:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ce6bb912b49ca9665cf509bbeb65fae SHA-1: 55b3de86973bac2d3d6ec6d24bd4e415c105c4c5 SHA-256: abe4b2a80ed4489e1734224812453b78be3adf54a863a1aabc60ed8b5399b63b
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=adobe+photoshop++gratis'. This URL is presented in a way that suggests a lure for downloading software. The document also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=adobe+photoshop++gratis
    • https://static.usrfiles.com/ugd/b48b60_e0239ceed4b946b29db549b09f68fb63.pdf
    • https://static.usrfiles.com/ugd/3fd21f_2041c7f5cbed4c81b2766a7c97b916c9.pdf
    • https://static.usrfiles.com/ugd/4f92c1_c2ac8b75420643a081aef51b8c6dcde0.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/newixo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/biomagnification_and_bioaccumulation.pdf
    • https://static.usrfiles.com/ugd/8dde66_574c7f5673f54fdbafdb5c89637e97ab.pdf
    • https://static.usrfiles.com/ugd/e2c250_9392e6af324346adb6fc672cb8e01399.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2ed47b51d8f4aab89b7306997f4a98c.pdf
    • https://static.usrfiles.com/ugd/ac51ce_cc9fb64bc2984a10a0342277160b4abf.pdf
    • https://static.usrfiles.com/ugd/3b0c81_2790a8733f60486d9c71248a603c92cc.pdf
    • https://static.usrfiles.com/ugd/e2a635_73a53daa89c347a5b519edaedd6b6b58.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_off000059e0.bin
38564518bd89908c3012975532c9d79f5a4018c2c1be7a80acaa063d84bc00b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E0 5320 bytes
font_01_sfnt_off00006bea.bin
ef39c2ec0c6520761e48d596cadac35065e72ca14fea9ddc6f6df3031908d175		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEA 10152 bytes

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