Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf2d9463219044a…

MALICIOUS

PDF

41.6 KB Created: 2020-08-31 12:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9cce1155a7bd830b0636a7a5c9198c1 SHA-1: 1edfea5b360423669f473fbcb2030b7cc7a897c4 SHA-256: 8cf2d9463219044aef43dfa4ab9f48ac5d11b420c8e8d6e48a79c0ee72487dbe
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.com/wix?keyword=legend+of+zelda+ocarina+of+time+rom+n64+romsmania`. This link is presented within the document body, likely as a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on `static.usrfiles.com`. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wix?keyword=legend+of+zelda+ocarina+of+time+rom+n64+romsmania
    • https://static.usrfiles.com/ugd/69695d_5864e0a89ac24cf2b5dc5b40fb19e789.pdf
    • https://static.usrfiles.com/ugd/b8c837_697aaf178e0b4b4287b4993b826fa0c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_f08824529f9b4738bcc0c7db2681c5c1.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1097/files/bsc_physics_numerical_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/9839/9139/files/ronenud.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1315/files/55463693742.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1095/files/category_theory_textbook.pdf
    • https://static.usrfiles.com/ugd/921909_c8a87b2e99384c7b9a5e309ab266953a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c71c59435294bb49a24a87059cfecf8.pdf
    • https://static.usrfiles.com/ugd/868401_1b514bb1987e438395039a33784aa4d6.pdf
    • https://static.usrfiles.com/ugd/ecec20_4c4fca955a404e76b136adec0d58ba58.pdf
    • https://static.usrfiles.com/ugd/b8c837_1da6a373220e4bd8a96f493599bd8d68.pdf
    • https://static.usrfiles.com/ugd/b8c837_79d62f8333df476db4b78d181843641c.pdf
    • https://static.usrfiles.com/ugd/0c268c_8126c7b44ef54036a021016cae9bd5c1.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_off00006329.bin
0933ce665079c4e2bcbc6bb37b20c928ca627cbd6a7573a27aef068fe1207b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6329 5576 bytes
font_01_sfnt_off0000761f.bin
a20f2c482f5793ebd04149c6d94991cb52f642b372a69790ba03be216ac7c0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761F 10344 bytes

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