Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd1b0e440faf714…

MALICIOUS

PDF

42.5 KB Created: 2020-09-01 04:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 368fd138f536b14d4815c4d84487471f SHA-1: 85aefde527a1a61a2af66294b4b024d9c657b104 SHA-256: 5cd1b0e440faf714aeb9e53d2539573a93445691784f326601d5d6ba8915685b
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a partnership proposal. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of a malicious redirector and a high ML score suggests an attempt to deliver a second-stage payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/wix?keyword=partnership+proposal+template+word
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_75479856e4f9424cb3a617519a938415.pdf
    • https://static.usrfiles.com/ugd/8d57bd_22237c9a6a6240f089e029b4f2fa1c2d.pdf
    • https://static.usrfiles.com/ugd/36f25b_df752b53097f4286a5cd235f1ec67baf.pdf
    • https://static.usrfiles.com/ugd/9c0842_5486b6db71f840b0aa6870fd85bf7672.pdf
    • https://static.usrfiles.com/ugd/3d0627_da8bc1908c0c4016845c9ae9a5a5cc59.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/cell_block_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/laboratory_glasswares_and_their_uses.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/negarisejolulim.pdf
    • https://cdn.shopify.com/s/files/1/0465/2865/9614/files/tizijonixazomawarodigere.pdf
    • https://static.usrfiles.com/ugd/b8c837_74b37849e3e245b4a22c5a00b4066290.pdf
    • https://static.usrfiles.com/ugd/97368a_c8144e497e9e4e21bd0c12caedb8940f.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c69bdd5ea6641f28ed114ab42664ee6.pdf
    • https://static.usrfiles.com/ugd/76156b_105cfc5d072445fd8636889490b9df69.pdf
    • https://static.usrfiles.com/ugd/c7a620_2094177790314fb3acec78a81456f04c.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_off000068de.bin
5d1602e10922fbd415bc7a9b8a1043cbfd3650dddd12b058c790484e3f27534a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DE 5292 bytes
font_01_sfnt_off00007ac2.bin
50ebb26a0de839a3b429df2c94f8ecd24eb0b5915c692c4f531524c66a6dd93a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC2 10128 bytes

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