Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79d9121d1aa23e2…

MALICIOUS

PDF

38.7 KB Created: 2020-09-01 02:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d215aac8d895445e04b41d86be80afef SHA-1: 32ca1f6ace5fbdb7b533611947995b2f42520eb3 SHA-256: d79d9121d1aa23e2f4869799d6a48b2238d592f1bfa24b46a50b9f5aecf88930
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=britain+for+learners+of+english+pdf+chomikuj'. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. The presence of a link farm and the ML classifier's high confidence further support this assessment.

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.ru/wix?keyword=britain+for+learners+of+english+pdf+chomikuj
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nifafujejugafux.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6341/files/bc_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0933/files/junidazulenonejonelebita.pdf
    • https://static.usrfiles.com/ugd/b4609a_43f4555193c14870a4167554af0e686d.pdf
    • https://static.usrfiles.com/ugd/111c46_109d226013924bcfb0b3d167f36aefbd.pdf
    • https://static.usrfiles.com/ugd/eda9ba_763f75e07218433db3c7676177ad9372.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e013ddffe1141b6ae4e7d874a777881.pdf
    • https://static.usrfiles.com/ugd/834936_7ab76ecf01674220bd49b7275936269f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1537bbddb36496ba8d58b19bf8e11e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_4493b3712e744fbdae29f68889328556.pdf
    • https://static.usrfiles.com/ugd/b8c837_b98bb2402670435e9064fa46bdc5ad28.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_off0000546d.bin
1698c0eb3450e73fe54015580e2e4faf954212966ba764daa44ed09cd795f63a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x546D 5756 bytes
font_01_sfnt_off000067e4.bin
99fcb7f22e30ce6bd9cffa4f1cbdc28d86520f332a0dd4d33276046abc5c34f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E4 11808 bytes

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