Malicious PDF — malware analysis report

Static analysis result for SHA-256 688a1db315e37e44…

MALICIOUS

PDF

35.1 KB Created: 2020-08-29 02:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c23be3dbd2711bcde54811b169379859 SHA-1: 240c91c69bd5c52faea5a8457441d0000c1c4d9d SHA-256: 688a1db315e37e4464832f4ba33866532ac53e8ef2183bd09e16a3cf62efd904
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is ttraff.com, which is known for redirecting to malicious content. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a link farm or redirection scheme. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate a malicious intent to redirect users.

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=sources+of+east+asian+tradition+volu
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_bbbf0d3f14394fbb96d46ad2b79530c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a5d1e81f406449aa9cbf9595a2968db.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f3dcc434ccf4713bb7ef50dd056a26e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b3c28caa47b4b82a743482ddadeec86.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5360/files/45227847507.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fiwowosilikaragufes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0250/files/picsart_app_old_version_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/19544958172.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/rowekuzafifibabamog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17418425376.pdf
    • https://cdn.shopify.com/s/files/1/0440/8147/9832/files/rational_numbers_worksheet_grade_9.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/83684909910.pdf
    • https://static.usrfiles.com/ugd/b8c837_656e513a77274f1c97b5d609382164e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb835e4e5b2b4850a9dce70c08322263.pdf
    • https://static.usrfiles.com/ugd/b8c837_033de887905148569c3e85de2ab17e19.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d862d8c369b475b88e180046f18280d.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_off00004ca0.bin
bcb70499e15000b2c7f37c39d586b3cad069bd9399fcef52e8de2410d964dc63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA0 5180 bytes
font_01_sfnt_off00005e43.bin
bea1406a9b8ee2d0739adb1cb125148c24d39b4327cf73cee65ca8c3dcb1f3cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E43 9912 bytes

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