Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd71ecb11266c44e…

MALICIOUS

PDF

48.3 KB Created: 2020-08-30 23:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd100814bd2f0aa49227689e837e2df5 SHA-1: d3feb679fe9d9b14ad93dda2064404f0fa4411b6 SHA-256: fd71ecb11266c44e30f52d214871a80a51d04c613f98ad7976421b4d6162ec38
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector to ttraff.ru. The document body, though heavily garbled, contains the same malicious URL. The presence of numerous other links hosted on cdn.shopify.com suggests a link farm or SEO poisoning attempt to mask the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=nh%25E1%25BB%258F%252C+t%25E1%25BA%25A5t+c%25E1%25BA%25A3+trong+m%25E1%25BB%2599t+m%25C3%25A1y+t%25C3%25ADnh
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/noxubufej.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/badebobekotiluwirukede.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7961/files/gmail_download_attachments_from_multiple_emails.pdf
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/customer_survey_analysis_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0440/4976/0421/files/learned_optimism_martin_seligman.pdf
    • https://cdn.shopify.com/s/files/1/0435/0279/6964/files/literature_review_on_vernonia_amygdalina.pdf
    • https://cdn.shopify.com/s/files/1/0437/9348/1885/files/87809137854.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/96213007325.pdf
    • https://cdn.shopify.com/s/files/1/0434/7196/2269/files/environmental_literacy_definition.pdf
    • https://static.usrfiles.com/ugd/b8c837_57f863d9bab34c468be7b9f1bb901095.pdf
    • https://static.usrfiles.com/ugd/9e41f0_f5d5405cc35442db8b7d2e59242a0dee.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3510/files/55945390198.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/l_t_annual_report_2012-_13.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/pipomupovewuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/zufirizugowimibi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/35021096455.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_off00006399.bin
a9707b26ab2717ed9d82601dc100a417087f8f3166262bd9d8ffad85919f1757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6399 5684 bytes
font_01_sfnt_off000074ed.bin
21e9c9d4e39b8642149abcd85f681c284511eb744f9050e69b0782c90246a927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74ED 21600 bytes
font_02_sfnt_off0000a3f8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3F8 4324 bytes

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