Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cf7ccd14157f19…

MALICIOUS

PDF

34.8 KB Created: 2020-08-31 22:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c01dbc4564705a3a1c49618d1f60fd23 SHA-1: b0e9c909ea0b7bf787ee5315277570454c553185 SHA-256: a4cf7ccd14157f19b67d8d343631fea5d1531158a415fb3fff78f0cac11857e8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a deceptive lure, indicated by the presence of a malicious redirector link and a large number of external PDF links, likely for SEO manipulation. The primary malicious URL identified is https://ttraff.ru/wix?keyword=blacklist+number+apk. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attack. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=blacklist+number+apk
    • https://static.usrfiles.com/ugd/cc03df_dc93f67fbe994a4983c74ad0218d7fc3.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d203d21240a465093e959cf2253ab73.pdf
    • https://static.usrfiles.com/ugd/80c1db_b408f26d40cc44b39482cfcc89aff5a1.pdf
    • https://static.usrfiles.com/ugd/87fdc7_a776f3f8cece4e42a03a1221e39c4e60.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_b4075297420c4f52a16507238cc13fbd.pdf
    • https://static.usrfiles.com/ugd/5b604d_2a7fa3e9cb264c42bd1e9b326bb3b371.pdf
    • https://static.usrfiles.com/ugd/76156b_406bf44eede34a11aee888e5744714e3.pdf
    • https://static.usrfiles.com/ugd/43d598_e23746a0c86a4c299d6174f17178a770.pdf
    • https://cdn.shopify.com/s/files/1/0430/7612/4821/files/ireland_visa_application_form_kuwait.pdf
    • https://cdn.shopify.com/s/files/1/0429/5278/6074/files/fzj80_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/xazepe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/protected_areas_management.pdf
    • https://cdn.shopify.com/s/files/1/0466/5635/6517/files/using_async_pipe_in_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8890/files/56903237330.pdf
    • https://cdn.shopify.com/s/files/1/0440/3727/5813/files/kaligurariwomaluxuzolaka.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/73177520278.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_off00004adf.bin
69e1eb669b1b7adf4a1033ec8ff59fc0a555df49e36a9616c39748aaa2c3073a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADF 5332 bytes
font_01_sfnt_off00005ce0.bin
a58e4793c2ee3adc70d0c45ef59024f1eaf15069509612f2f8242a75b3db5dcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE0 9912 bytes

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