Malicious PDF — malware analysis report

Static analysis result for SHA-256 a424913d86e4a6b0…

MALICIOUS

PDF

36.6 KB Created: 2020-09-01 02:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 600b22a5165a8cc4b032918ba11c2ec5 SHA-1: 78cc3651e8f124880fab552fd523f4b8feb62cbe SHA-256: a424913d86e4a6b039cb7156bf77aab29092bc6e6b17fa8c11c5d85b4793bcbd
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be related to educational worksheets, suggesting a lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. No scripts were extracted, and the PDF structure itself did not reveal specific exploit techniques beyond the malicious links.

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.ru/pify?keyword=ionic+and+covalent+bond+worksheet+pdf
    • https://static.usrfiles.com/ugd/ec0c41_0e60cb8d93d3488780835d4d878ee2e6.pdf
    • https://static.usrfiles.com/ugd/f4de5e_fae70cdd470f404b9be3f0b7df8ca700.pdf
    • https://static.usrfiles.com/ugd/1813b3_a7c38f49c5b146349d37474181fcc6a0.pdf
    • https://cdn.shopify.com/s/files/1/0463/1140/7776/files/graded_exposure_worksheet_get_self_help.pdf
    • https://cdn.shopify.com/s/files/1/0438/4204/4066/files/bam_bam_bol_raha_kashi_song.pdf
    • https://cdn.shopify.com/s/files/1/0435/0679/4651/files/sitekin.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/r_random_number.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/79687635553.pdf
    • https://static.usrfiles.com/ugd/80bfa9_689c1e1f7bf84f3ab373a47342eb3735.pdf
    • https://static.usrfiles.com/ugd/b8c837_317bc0550ebd4c2b950a42dea582c972.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca8b8eee8d4640038560f46e57c8d783.pdf
    • https://static.usrfiles.com/ugd/b8c837_0338f5d633874bff8d46a7c7cbcb0038.pdf
    • https://static.usrfiles.com/ugd/a4d998_3cf1b632e0894ad9b686501629bd35fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_aeebd7db88c8442e936308865a7e3e88.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_8c961f3322f6469fa1a8cc4fce4fd7a3.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_off00004fdb.bin
9b1c060071b374b86ef1fbcf00c78e105a34f757db01647191d13bbe226d59b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FDB 5536 bytes
font_01_sfnt_off000062b8.bin
ffcb2f555d299eb79e9660f60be81c9aedcbde5b27d4f802005a82ff9d906b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B8 10264 bytes

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