Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e81a30222f79bd0…

MALICIOUS

PDF

44.3 KB Created: 2020-09-02 18:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2987532658ce7e651fcd81121a366cac SHA-1: d0cccc17b34048ac8c921739892aeb7882e90103 SHA-256: 1e81a30222f79bd0189dafb289991d0a8a912296fec899bf321c4dd4aeb3dae0
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, masquerading as educational worksheets, which is a common lure for SEO spam and phishing. The primary link directs to a known malicious redirector, indicating an attempt to lead the user to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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.me/wix?keyword=comprehension+printable+worksheets+for+3rd+grade
    • https://static.usrfiles.com/ugd/bcd086_d9866278f10a4ea39f59f4c606c40336.pdf
    • https://static.usrfiles.com/ugd/ced2dc_a7b8c6eae7324769adb54f4149565025.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7273b7c71ec4c0b95ebea59f1d08325.pdf
    • https://static.usrfiles.com/ugd/8e1900_be3a4eb797674875956882cef537f2a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_244c20871d254709ae39f38d64059956.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_e0e4dab4aae542728f3a98e23c9809b3.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/vawizabezudovenu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9843/7784/files/pirates_of_the_caribbean_sea_of_wrath.pdf
    • https://static.usrfiles.com/ugd/b41a9a_62339eaf29374ad29a874c8d59a113a4.pdf
    • https://static.usrfiles.com/ugd/f84671_3c1e19e032c04572aa5ec36e2808742f.pdf
    • https://static.usrfiles.com/ugd/455f95_71cee377316b46619e1b9d6ae370a7b0.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_off0000676c.bin
ad11554bc8802a366322bfe8638d9b663aa82afd8357f8be9f4bfde79b1631f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676C 5820 bytes
font_01_sfnt_off00007b16.bin
0b362d141055567e5385cef7d9c51e13a17d3c3ab109dce7c56555a805cafcdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B16 12364 bytes

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