Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba11956e8a72779e…

MALICIOUS

PDF

37.0 KB Created: 2020-08-31 01:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceaa476d5f24008fcef97b38f1d4c4bf SHA-1: 91ce383883fe97780c49155e04c08120346a8284 SHA-256: ba11956e8a72779e9956420496e5fc47f034b78e9a1e24e684f2b259720a8076
152 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.ru'. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on Shopify. The ML classifier strongly supports the malicious verdict. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=a1+level+reading+passages+pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2600/files/aajeevika_scheme_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/12011803694.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/homefront_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/62199345807.pdf
    • https://static.usrfiles.com/ugd/b8c837_4467c5b00ebe4e0292dafdbfc202cd1a.pdf
    • https://static.usrfiles.com/ugd/e4a001_e02f4251376342129b4112e027fddfd2.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec91ed554d8b4c7890fbe5ab775b1a12.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/dutotunufabasiwewitotuma.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/qsofa_sepsis.pdf
    • https://cdn.shopify.com/s/files/1/0450/9345/3987/files/automobile_engineering_reference_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/dewowiwawano.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6503/files/bbc_weather_report_cairo_egypt.pdf
    • https://static.usrfiles.com/ugd/1f2646_0617b986931541bda48280e3630798a9.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_2854ce1040ff49f48d4c0812ddddb16f.pdf
    • https://static.usrfiles.com/ugd/09273f_68760e2c003c4120ae18428ddfec3288.pdf
    • https://static.usrfiles.com/ugd/b8c837_e43cd70dca8b46ba9686f78f1d9aba3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7649132ef5904122b1299c1e52f472a3.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_off00004858.bin
2b95e69f4a536e636aaf5cdb51470d777907c0aa1455565dda5aa533cfc5a942		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4858 4908 bytes
font_01_sfnt_off00005912.bin
ee245218f667c0d74cd2b051311e0134a8df03a9379a9c4ffbab7ec11029f3bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5912 9324 bytes
font_02_sfnt_off000078ee.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 4324 bytes

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