Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaacbe00a91b3782…

MALICIOUS

PDF

42.3 KB Created: 2020-08-12 08:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61c0e20cf968096a3003c427f326d253 SHA-1: 5e3a806bbbda6f4b15a3c92b1c992ff39ac31e7d SHA-256: aaacbe00a91b3782a7e2ca6a2ad41a1a50fa52c46c188ae2b691ae6a4e750c80
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.com/wb?keyword=gcf%20and%20lcm%20worksheet%20for%20grade%204, is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to educational worksheets, suggesting a lure to disguise the malicious intent. The presence of a malicious redirector indicates an attempt to lead the user to a malicious site.

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/wb?keyword=gcf%20and%20lcm%20worksheet%20for%20grade%204
    • http://files.thesisterhoodtrainingsite.com/uploads/1/3/0/8/130874520/sizerazaze-valewivis.pdf
    • http://files.shaktiflowyoga.com/uploads/1/3/1/3/131380440/9cd1ebc421b488.pdf
    • http://files.primordialartstudios.com/uploads/1/3/1/4/131409761/1d6e08092.pdf
    • http://files.sfvlsa.org/uploads/1/3/1/4/131453934/ac05a9bc8.pdf
    • http://menoferu.3drenderingandesign.com/uploads/1/3/1/4/131406717/afb7bf205.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/26509234076.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/vaxuxodug.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/gukutetu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1300/3674/files/asus_zenpad_z8_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/zurareronujosomibul.pdf
    • https://cdn.shopify.com/s/files/1/0428/7696/0924/files/71197707197.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7961/files/62836676797.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8695/files/dietrich_bonhoeffer_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0432/0418/2173/files/51835512548.pdf
    • https://cdn.shopify.com/s/files/1/0437/3702/2615/files/jepawalo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6754/files/vuwakikanupopevetenax.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_off00006697.bin
4577952c7e8a69083dfc37898b37635b637890a48c4b92b7c4c9051c5eb12838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6697 5708 bytes
font_01_sfnt_off000079fd.bin
cdde91b91c69377519a662b9f2f3524f250735d89de9ee4833e2c324f4ad0b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FD 9992 bytes

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