Malicious PDF — malware analysis report

Static analysis result for SHA-256 196fb41dd5845e6b…

MALICIOUS

PDF

45.6 KB Created: 2020-09-02 01:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccb8b9148521d512d2f97b97f054722d SHA-1: 478497c6644ac7e9128905716343c07cdb2ddd70 SHA-256: 196fb41dd5845e6b16b64267c8ee2f194566c34986bd6a24a5fc12125aa30722
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, identified as a link farm, pointing to external PDF documents. One of these links, https://ttraff.com/wix?keyword=angular+mat-+checkbox+formgroup, is flagged as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly indicate a malicious intent.

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=angular+mat-+checkbox+formgroup
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0bcf16_66d823f4871e44d0979c69c457fcee1e.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_0aca78ccfb8b4d4091fbe730823bd060.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd7a7dff12284ecf9853e3bbb2a7b9bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f3c9b208a314ac3b35194506fae5083.pdf
    • https://static.usrfiles.com/ugd/82e28d_ff33a71596d04fb5aaa40282aab3d56f.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/kigixilu.pdf
    • https://cdn.shopify.com/s/files/1/0462/7349/5200/files/88192821412.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/avian_influenza.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbe3e27c4de042d8b924d2f59be0f480.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_ce936ef5562b4f4ca8ccfd17f026a1e9.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1547/files/paging_and_segmentation_in_os.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/82199703059.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/74637830811.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9561/files/pasobikeweresadofipo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7279/6310/files/divinity_original_sin_enhanced_edition_beginners_guide.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006846.bin
d967a661693dbbc8a09e5a26a2e6397189941b5368a6883d33c91874871d0baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6846 5544 bytes
font_01_sfnt_off00007b0b.bin
74e7fc5e010a2bc580bd9670ebcdf608821a142993cbd856f2e8a5e05c909068		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0B 14704 bytes

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