Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9881f2162a8003…

MALICIOUS

PDF

40.1 KB Created: 2020-08-29 16:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9685ffa3f84a3a2576b4d0d95936b79 SHA-1: 73dab7b0d17c1b6cabab19f8268746a2864538a6 SHA-256: ea9881f2162a800377d2cdb7c10098d337c2718e3cf762cda30cf2d90d401b7c
150 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'gratis download buku pdf', suggesting a lure to entice users to click the malicious link. The PDF_SEO_LINK_FARM heuristic further indicates a large number of external links, many of which point to the same domain, likely for SEO manipulation or to host further malicious content.

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.cc/wix?keyword=gratis+download+buku+pdf
    • https://static.usrfiles.com/ugd/b8c837_bd747435b33343c48ba00d9f70897bde.pdf
    • https://static.usrfiles.com/ugd/a298ce_194d877236e745fb82f094931930bed4.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f2b7d9a47da44d293e0ccd689a5c3cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0d719c7cbb34ac58bc1becf29c5f5e5.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/integrated_electronics_analog_and_digital_circuits.pdf
    • https://static.usrfiles.com/ugd/b8c837_6903746f92c34522a1c43f30543d62ce.pdf
    • https://static.usrfiles.com/ugd/77d535_5622801c8725480a991cda6adef85895.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_767805ba3f784b41be6a111bfb749314.pdf
    • https://static.usrfiles.com/ugd/b8c837_e60d38d172564e7582d1c6a0d27d4e02.pdf
    • https://static.usrfiles.com/ugd/b8c837_90377477b0904e5ababda945b3dd6dce.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_off0000606f.bin
6ba1c6d2794893e2671ea48e21bf56e01b839d1819c4231a41fef9c25dbccd84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606F 5364 bytes
font_01_sfnt_off000072d3.bin
8cf23c61f07a1aef345e5c9e8670da80191962b17750913f7a8ac4574b7fcb79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D3 9824 bytes

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