Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58bb821721a4092…

MALICIOUS

PDF

42.8 KB Created: 2020-08-29 20:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab23cc9e7869c8f872e3753d0d8576b4 SHA-1: e3220a7ea32242297f0d46807ce738dc62a905fe SHA-256: d58bb821721a40921e09841eae5cd343aab7eddb4ff703658d8470c5560f272f
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The embedded URL points to a redirector, likely used to obscure the final malicious destination.

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.club/wix?keyword=belajar+kunci+gitar+pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0432/5851/1522/files/eenadu_epaper_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1739/4586/files/54049680423.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/doduvexetojenugomudobi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0570/5374/files/android_10_release_date_and_time.pdf
    • https://cdn.shopify.com/s/files/1/0428/8738/1155/files/47818161182.pdf
    • https://static.usrfiles.com/ugd/b8c837_6092b3066be64f619276da9c6bc99ee2.pdf
    • https://static.usrfiles.com/ugd/4dd980_af9d6490a12b40d3928469d182ce9c6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b6aa1f6836a47dfb7b7df5241736d61.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d1f8fe4a33d46089843b871d05a5bbf.pdf
    • https://static.usrfiles.com/ugd/b8c837_2229764c12d54c46a3608358a2e1f340.pdf
    • https://static.usrfiles.com/ugd/b8c837_be9f28fe57fe4203af86192898d17ca9.pdf
    • https://static.usrfiles.com/ugd/e4ff69_5550e35739fb4f7e87077afb253fd0ba.pdf
    • https://static.usrfiles.com/ugd/0a0016_2ead17b97bfd40aabd6164c6fa8d7aee.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_off00006ac3.bin
9d2e29ae30a1f3a5dc2ce4700fb6b7b024192cf96520ef5bf43ef1843abc0dff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC3 5336 bytes
font_01_sfnt_off00007cf9.bin
43d092327da136a6521cd8261aafc3402dca3ec4271f94843e052da361c51487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF9 9724 bytes

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