Malicious PDF — malware analysis report

Static analysis result for SHA-256 95dce12982738e69…

MALICIOUS

PDF

41.9 KB Created: 2020-08-13 02:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebc19e2e2b7d4f535c627a655db86b1a SHA-1: 8062b22167d01af64c6efa2fcc76c506c1e51b0d SHA-256: 95dce12982738e69749df7ead5e6c644051ef3f8100d08a788cef4a47bb7e6a5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, https://ttraff.com/pify?keyword=adverb+of+frequency+test+pdf, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector and the link farm strongly suggest a malicious intent, likely to lead the user to further malicious content.

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.com/pify?keyword=adverb+of+frequency+test+pdf
    • http://punojaw.lilaondiamond.com/uploads/1/3/1/4/131406947/6a081e405b9e184.pdf
    • http://vosabol.michaelyadvish.com/uploads/1/3/2/6/132680903/parazup.pdf
    • http://files.hoppeglass.com/uploads/1/3/1/4/131406412/35bdba40e1.pdf
    • http://sekas.airowholesalegift.com/uploads/1/3/0/8/130874388/8530639.pdf
    • http://vugezu.gosiakart.com/uploads/1/3/1/8/131856703/1445115.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1085/files/assessment_testing_and_evaluation_in_teacher_education.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/diganik.pdf
    • https://cdn.shopify.com/s/files/1/0437/4049/6033/files/answer_sheet_pet_cambridge.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/68899139429.pdf
    • https://cdn.shopify.com/s/files/1/0435/1387/2548/files/lopozofineganipasi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/45134010415.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/suvozudadonarufuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/66840817761.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/71741887407.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/kozegojikomodazakiba.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8069/files/809643173.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/zemalawirixu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2341/files/90819025774.pdf
    • https://cdn.shopify.com/s/files/1/0434/6154/2045/files/argala_stotram_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/7315230094.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_off000057eb.bin
bb19fcc816145b6d39d9920a6e5f2d1a67d51e3cbf680eefe1b0fe928b7bcae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57EB 5160 bytes
font_01_sfnt_off0000698a.bin
fbdb592dd40d82dd1210f8b36f97ea65eb2a5ff8852d16d9140b32e4813eb045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x698A 10216 bytes
font_02_sfnt_off00008c61.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C61 4324 bytes

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