Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ec55b6f9588751…

MALICIOUS

PDF

34.8 KB Created: 2020-08-31 16:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d70badc1108741ca43cf968444a218b8 SHA-1: 9dbf8a6f95bb64b75a8a63dd46741d28ea34f2bf SHA-256: f9ec55b6f9588751ed6d1ab28ea53754a62bc6d0042d5f63f222613689487eae
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified as a link farm. One of these links, https://ttraff.com/wix?keyword=platformer+background+tileset, is flagged as a malicious redirector. The presence of a large number of links, many pointing to external PDFs, suggests an attempt to manipulate SEO or redirect users to potentially harmful sites. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=platformer+background+tileset
    • https://static.usrfiles.com/ugd/1df9ea_ee9c7a2b0dd243bb85340217427d44a7.pdf
    • https://static.usrfiles.com/ugd/4b68be_a10b81f81b8748da90275e25bd826105.pdf
    • https://static.usrfiles.com/ugd/cc15ef_39b3989c493b4d56b453af42ba0f0933.pdf
    • https://static.usrfiles.com/ugd/b48b60_8b518f6290894566bf9fb588a344a608.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_ce140013a7914df0b80ea3abf7824e1c.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4950/files/38567010947.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/13398540469.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/8262039127.pdf
    • https://static.usrfiles.com/ugd/097bd5_00fc9c9e5d5f4a7c8c804b5375edd355.pdf
    • https://static.usrfiles.com/ugd/b11f6d_6ef91991900642d6a6eb1fee74d833a8.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_off00004807.bin
37114919c8a5a80b547f9e3b2001c75063fea603b029fae759862e7578baf957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4807 5544 bytes
font_01_sfnt_off00005ad2.bin
1f487a38dfac8e68b907cdd5ccf8bb733392c51299fa84ec22b31c56c69876db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD2 11324 bytes

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