Malicious PDF — malware analysis report

Static analysis result for SHA-256 10775e00c8f9bc51…

MALICIOUS

PDF

71.0 KB Created: 2020-09-04 22:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99e5cc1ec0c9161079715e9634e2e6a8 SHA-1: 9b9467c5fbfadf8c3307eaa06e1f01fe2ea9be72 SHA-256: 10775e00c8f9bc51f84fc37769a6f03732c263355713a17fbc4b6bd9f752d8fc
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=cranial+nerve+exam+proforma'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign PDFs hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector suggests an attempt to lead the user to a malicious site, likely for phishing or malware delivery.

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.link/wix?keyword=cranial+nerve+exam+proforma
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/vocabulary_list_for_ielts_general.pdf
    • https://cdn.shopify.com/s/files/1/0438/3395/0358/files/97232911589.pdf
    • https://cdn.shopify.com/s/files/1/0448/1892/3686/files/polisacaridos_en_alimentos.pdf
    • https://cdn.shopify.com/s/files/1/0432/4101/3415/files/famazipifi.pdf
    • https://static.usrfiles.com/ugd/6290de_bb264b3d337a4989b39693706cd3a3f0.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_85bb5958424a4bed90e71a5e076c11ff.pdf
    • https://static.usrfiles.com/ugd/6f53d7_e92a2c2fa1e94287b7bed0920f4a4857.pdf
    • https://static.usrfiles.com/ugd/73c254_a01b38892a62475f905117f0492a5272.pdf
    • https://static.usrfiles.com/ugd/822ecd_aff071704582481db59f4b903ed9a026.pdf
    • https://static.usrfiles.com/ugd/23e9be_18280a3e599f4d77899a1316a9a23a84.pdf
    • https://static.usrfiles.com/ugd/5c139a_07d660fa1686496a97abe51f2add439f.pdf
    • https://static.usrfiles.com/ugd/4dd980_c0f184a5d3bf4ff3ac7ab2ab5d9f6311.pdf
    • https://cdn.shopify.com/s/files/1/0440/2610/1925/files/jetibabef.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/tusiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/2477433408.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_off0000db8c.bin
d973d34792957c879b10a8fbca4608276a99c42745b9fc84267e186684433263		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 4900 bytes
font_01_sfnt_off0000ec2a.bin
6b05305011b25619ed1b7e33626aff90166caa353169ffc87f9ea36be82fa4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 10144 bytes

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