Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e329e677063413c…

MALICIOUS

PDF

46.6 KB Created: 2020-07-13 23:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc7a9c0bf86ea675cf6bbac4de85c38c SHA-1: e2cf752087442bafee6c1d3209b351e0da104a40 SHA-256: 4e329e677063413cfb38314c8e9b08d517c37cbba364b9c90e90dfd4b0191f80
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which are part of a link farm hosted on Shopify. One of these links redirects to a known malicious domain, ttraff.cc. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's not a legitimate document but rather a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=spelling%20for%205th%20graders%20worksheets
    • http://files.voterodcasey.com/uploads/1/3/0/8/130874122/c2f9b27cfb.pdf
    • http://files.safeumich.com/uploads/1/3/0/9/130969278/xovod_tumosedal.pdf
    • http://files.john3ministries.org/uploads/1/3/0/7/130775171/5969093.pdf
    • http://files.childrensmarketatthemill.com/uploads/1/3/2/6/132682040/bonoripo.pdf
    • http://files.1afan.com/uploads/1/3/1/4/131437834/98f285717de.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/25527495312.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/74731655775.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/povumad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://faxotobajej.files.wordpress.com/2020/06/83269684310.pdf
    • https://gozikes.files.wordpress.com/2020/06/zufisativu.pdf
    • https://daxetojip161513793.files.wordpress.com/2020/07/jegikupakukusafuje.pdf
    • https://mukabiri.files.wordpress.com/2020/07/84163329847.pdf
    • https://parobilonez.files.wordpress.com/2020/06/12454934805.pdf
    • https://cdn.shopify.com/s/files/1/0434/1743/6312/files/57793978027.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/13445946351.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/63158198992.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0432/8764/2267/files/papalewil.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/balifuvupopevijakokoji.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_off0000775b.bin
d253752f2073a41250b458203ec4d5a778cc81b6c5f6358811233eadd6a99404		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775B 5476 bytes
font_01_sfnt_off000089ff.bin
9851594646e03b72bfc79fdc07c004b9ab075676282cd3643e4c8cd128f997df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FF 10208 bytes

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