Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7840e8da8364905…

MALICIOUS

PDF

46.9 KB Created: 2020-08-14 19:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e83d370c2de4c9b4ae4f979fcb9f25d SHA-1: f22eefdae5e8bc4a648f6037dc013f4503435da9 SHA-256: f7840e8da8364905cd3d1a94506501c1b5ac67ca6416bc7a842ca313b9ffcab2
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, while another noted a large PDF link farm hosted on Shopify. The document body contains garbled text but includes the URL that triggered the malicious redirector heuristic. The presence of numerous links, including one pointing to known malicious infrastructure, suggests a phishing or redirection attempt.

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/wb?keyword=yongnuo%20speedlite%20yn560%20iv%20manual
    • http://renuro.threeseedsfarm.com/uploads/1/3/0/7/130776485/8864756.pdf
    • http://vagemaviz.newwoodfordhs.com/uploads/1/3/1/4/131407406/7253464.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/59805075729.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/foliduripe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8086/6197/files/39625834021.pdf
    • https://cdn.shopify.com/s/files/1/0429/1703/6198/files/41671293102.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1866/files/50706339067.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/ribijopuro.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/kijedetufin.pdf
    • https://cdn.shopify.com/s/files/1/0428/7440/5023/files/13441224816.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/applebee_s_international_inc_fiesta_lime_chicken.pdf
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/76531180554.pdf
    • https://cdn.shopify.com/s/files/1/0440/6178/6262/files/how_to_merge_docs_together.pdf
    • https://cdn.shopify.com/s/files/1/0435/4097/1674/files/sebagovafufekugun.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/mezukesenisupumasaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067de.bin
eae5a4f95b006d1ca02afcfe989382b9214acd7f40de00c64c46bc4b5c895109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DE 5728 bytes
font_01_sfnt_off00007b5d.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5D 1800 bytes
font_02_sfnt_off000083ea.bin
b6044e802dccaed17d4bbb5521dea920e9e3872c72925e183643772838310c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83EA 13512 bytes

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