Malicious PDF — malware analysis report

Static analysis result for SHA-256 4440d19f5cbb5c2b…

MALICIOUS

PDF

79.5 KB Created: 2020-09-10 06:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1f05fed3aedcad60c6235b7fd52c549 SHA-1: d9cd3d1b1f5f4637ca03b2c979957f754ff66100 SHA-256: 4440d19f5cbb5c2b3357494b4910e674d2751f4cb7d6edf7c3e82d9d798d9a32
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text referencing 'Dell precision 3520 specs sheet' and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, likely part of a link farm to improve search engine ranking for 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.ru/wix?keyword=dell+precision+3520+specs+sheet
    • https://static.usrfiles.com/ugd/03ae60_07be1c4b7c5e487fbfedfb5dc5742828.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_53d2a29cf4e04e6bb051816a7f0e6de8.pdf
    • https://static.usrfiles.com/ugd/429b25_ca00e3e932304f9691cbc2460033579d.pdf
    • https://static.usrfiles.com/ugd/15ebe2_41396a952df246a3999e3aaed17cfad2.pdf
    • https://static.usrfiles.com/ugd/b8c837_aab46271fa4b4c2c8da4aa8f71a5113e.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/productos_notables_ejemplos_ejercici.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/zuzunowojalixigo.pdf
    • https://cdn.shopify.com/s/files/1/0459/7488/0423/files/star_wars_resistance_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/4429/8133/files/mukewuvof.pdf
    • https://cdn.shopify.com/s/files/1/0437/1451/1001/files/vitexuwuxex.pdf
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/fundamentals_of_corporate_finance_3rd_edition_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/5371/1513/files/catalyst_athletics_strength_program.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/64574289316.pdf
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/resesokutiwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/20537939461.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07a.bin
99ded188e226e39593a4890b6298adbe856badd97d15f700ba9500dddfb2f533		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 3036 bytes
font_01_sfnt_off0000db43.bin
1d89dd4167294fdd51526a6bed7b76bba70de5969cd8ef3f5c174bcfb4962a63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 5160 bytes
font_02_sfnt_off0000ecc5.bin
36725fa5484d3f850f83c75aad20f9f038e3b3c64fb4142fd1d894671cff9b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 16732 bytes
font_03_sfnt_off00012086.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 4324 bytes

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