Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7996df3a61f55bc…

MALICIOUS

PDF

44.6 KB Created: 2020-08-01 16:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96e483d35fbc6d34da83fd4bd11b3d71 SHA-1: a13e27180ebe9ed93f037cf14fd95a42779bbdbf SHA-256: e7996df3a61f55bce0d868cfffbca2ec74d9e9c01add434ad4cec8e6925bfad1
150 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'https://ttraff.com/pify?keyword=tikkun+korim+pdf'. Additionally, it contains a large number of external PDF links, indicating a potential SEO manipulation or link farm tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the numerous outbound links are the primary indicators of malicious intent.

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/pify?keyword=tikkun+korim+pdf
    • http://files.jandjfinancialsolutions.com/uploads/1/3/0/7/130738876/cb7aba090c.pdf
    • http://files.castlewoodclays.com/uploads/1/3/0/8/130873907/b18a71fa7bc6.pdf
    • http://files.pastelsinbloom.com/uploads/1/3/1/6/131606208/jidonaxumoju_konigunut_lasidi.pdf
    • http://files.parkavenuetutors.com/uploads/1/3/1/4/131482853/d3366fa4e.pdf
    • http://files.mastergardenerscabarrus.org/uploads/1/3/0/7/130775192/e88291e.pdf
    • https://cdn.shopify.com/s/files/1/0430/9745/6801/files/30600224737.pdf
    • https://cdn.shopify.com/s/files/1/0428/3501/7884/files/bavulanolewetaraxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4224/9631/files/saxepasikobetobokakuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/88521941281.pdf
    • https://cdn.shopify.com/s/files/1/0433/4573/9941/files/69498142133.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/60013190952.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/62220281402.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/32114950520.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebisineseboji.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/60608511544.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/viliwurize.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/52920422246.pdf
    • https://cdn.shopify.com/s/files/1/0429/4426/6399/files/1052115699.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zutazalurofesavasa.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_off00005de2.bin
f0840ddcc2342b3075ac8476c78ea3a3cd2e28d4467526333f4bd6a881b5d744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE2 4780 bytes
font_01_sfnt_off00006e11.bin
ed700182de34cb1adeda68111537894c439a1c594c483da293a0489a3b3569d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E11 17844 bytes

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