Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb03ca0ae403416…

MALICIOUS

PDF

52.9 KB Created: 2020-08-06 13:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b35e6dc20340fceb5b81eb690e028b8 SHA-1: 5c8b5156c578b5740a804134c030ed8f369745b0 SHA-256: dfb03ca0ae40341665be1d91c0e03c1658bca6618c327005e4db8e0864c426a3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'cdn.shopify.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure users to a malicious site.

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=performance+appraisal+sample+phrases+pdf
    • http://files.pcbudgetsolutions.com/uploads/1/3/0/7/130740212/zenakefogimat-patofukav-kokotamudut-domukero.pdf
    • http://files.uamiztontli.com/uploads/1/3/1/3/131383456/zetegumo-novakowoperuru.pdf
    • http://files.otterworksusa.com/uploads/1/3/1/4/131437351/tasegus-rekafi-zeganusisaj-jigavulef.pdf
    • http://files.rabbisussman.com/uploads/1/3/0/7/130739344/nefem.pdf
    • http://nulisumus.zportman.com/uploads/1/3/2/6/132695384/fosubozuvik_nelawot_misojotenixo_gigefoti.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/57558332657.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/java_read_file_line_by_line.pdf
    • https://cdn.shopify.com/s/files/1/0431/7836/0987/files/37959912958.pdf
    • https://cdn.shopify.com/s/files/1/0432/4917/2635/files/xiwilegolodode.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43377474007.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/sindrome_de_asperger_en_la_adolescencia.pdf
    • https://cdn.shopify.com/s/files/1/0439/8995/8814/files/wobapa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4175/8101/files/93875470152.pdf
    • https://cdn.shopify.com/s/files/1/0431/6515/5489/files/mebufu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8544/files/pivofukopuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/6051/0376/files/format_of_vertical_balance_sheet_and_income_statement.pdf
    • https://cdn.shopify.com/s/files/1/0428/5962/6655/files/wirizume.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_off000090da.bin
9fa8730b4d3e33fb8a1b799d08dacb2791fe6985eaae08a6f3cf99a3d25f1edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90DA 5396 bytes
font_01_sfnt_off0000a302.bin
63f5743971a8b69d7d0dc3244a158259fbf6a9b93fc0004c65ac8f69f0a3f309		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA302 10272 bytes

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