Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd697fc665e2debf…

MALICIOUS

PDF

58.4 KB Created: 2020-08-31 05:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d47e6d0b8b4b44458d5aba938778b15 SHA-1: 1ff20d137561a0ac5d44f464644118edd7158465 SHA-256: fd697fc665e2debf2a2ce7faa926a08911444c872a288f6c81c80a83d65665a6
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://ttraff.cc/wix?keyword=free+manuscript+paper+for+piano', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to both the malicious redirector and a benign-looking PDF, suggesting a lure to a link farm.

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=free+manuscript+paper+for+piano
    • https://static.usrfiles.com/ugd/ec0c41_1f65ea87f66340d3998bc39d0dd90ebd.pdf
    • https://static.usrfiles.com/ugd/34ec99_35b7cb77a5854237895840c9dd4fd779.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_75853931a081441985fa2150819156fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3cddb0cad2f4dfdb061d0873098eabd.pdf
    • https://static.usrfiles.com/ugd/b8c837_96d04563b91e43d4904875a785eaa00c.pdf
    • https://static.usrfiles.com/ugd/73f3b0_f967290bb1b247c1a9d28be2ba56ed2a.pdf
    • https://static.usrfiles.com/ugd/6c032c_df3d4e5500e9482ea3558a984902bb75.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdc77f2aa0844d95be48d2cfbe874bbd.pdf
    • https://cdn.shopify.com/s/files/1/0464/7220/0342/files/85587225563.pdf
    • https://cdn.shopify.com/s/files/1/0444/0922/5382/files/biology_book_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/4550/9537/files/adverbs_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/8341/5204/files/7291868399.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073fa.bin
4ebbc1c0fc4be64260bf0d4f896b0dbf8299200a019f49aafb7209d34f647e8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FA 6648 bytes
font_01_sfnt_off00008470.bin
8708c9271b7490f0637319cabba95f237fc5bc7f7827bbd23480c7272c9f8721		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8470 4968 bytes
font_02_sfnt_off0000952f.bin
95e98b55e6d8fc3407291f6177ceb90e20b4b017dc74ebb7393aed1fb2a841de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x952F 10660 bytes
font_03_sfnt_off0000b937.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB937 16092 bytes
font_04_sfnt_off0000cdfe.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 4324 bytes

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