Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40458c9c4fad2ac…

MALICIOUS

PDF

41.8 KB Created: 2020-08-08 12:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48beb4f1a68b61765f86e6211f9afec9 SHA-1: 238fc469a6693d184814ec86d1f1e9bcdb30b633 SHA-256: b40458c9c4fad2ace6643d54cbce207cc9978fb871f24342073537f73f49554c
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are hosted on Shopify and appear to be SEO-driven content. One of the primary links, however, leads to a known malicious redirector at 'ttraff.cc'. The document body, though heavily obfuscated, contains the string 'Elementary algebra worksheets with answers pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of numerous PDF links, including the malicious one, indicates a link farm or redirection strategy to distribute further malicious content.

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/pify?keyword=elementary+algebra+worksheets+with+answers+pdf
    • http://files.wildwoodoutfitterspa.com/uploads/1/3/2/7/132712139/sukupifadijavipe.pdf
    • http://files.selectlearningmaidstone.com/uploads/1/3/2/8/132814048/vafilixatimupabu.pdf
    • http://files.efdesign.studio/uploads/1/3/2/7/132740278/nipud-fafupilol-duxodevow.pdf
    • http://files.allison-kiefnerburmeister.com/uploads/1/3/0/7/130738792/6412098.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72518400380.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/67052810408.pdf
    • https://cdn.shopify.com/s/files/1/0432/8253/0472/files/55915426875.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/54410647445.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9564/files/free_johnson_outboard_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/xenev.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/rijarusaludi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/yakuza_5_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/fipadixarimazarabilim.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5149/files/52860398474.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3166/files/27471241339.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_off000063b9.bin
a2077a033605421dca3b803c9ace6c4d52b6b99893bcc2c152f97336f07cb84f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B9 5812 bytes
font_01_sfnt_off00007772.bin
a3183f2ff44620a2cb9f86740b7fef7537ab6c5fc1ef8c5f028ce9f6816e642f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7772 10172 bytes

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