Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3926d43c5baa8f…

MALICIOUS

PDF

42.0 KB Created: 2020-08-25 01:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e1417b3a048a092b420bc35c3048fe0 SHA-1: 6c4f00cb4ad9a8405ed7a94836287c8fb5e1fb99 SHA-256: 9f3926d43c5baa8f1f24853300b25deedea333ea438a725bb75af81f2fc7833b
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identifies a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and URLs, including the malicious redirector and several Shopify-hosted PDFs, indicating a likely attempt to lure users to malicious sites or distribute further malware.

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/pify?keyword=counter+strike+1.+6+mac+yosemite
    • http://luvasux.arvidtorres.com/uploads/1/3/0/8/130814328/969335fd.pdf
    • http://files.manupagainstbullying.org/uploads/1/3/0/8/130813988/sezumikofelofuzazaw.pdf
    • http://files.realnancykrulik.com/uploads/1/3/0/9/130969999/robarex-fenina-dejaj.pdf
    • http://xurapuv.bscleathers.com/uploads/1/3/0/8/130874063/zaruwuwemupefo-jaletu.pdf
    • http://gaken.pierrefamille.com/uploads/1/3/1/3/131380600/vujuwev.pdf
    • https://cdn.shopify.com/s/files/1/0437/4865/5265/files/payment_by_proforma.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/jumujivi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8459/files/strictly_come_dancing_2018_final_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/9423/5553/files/84341922823.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/cause_and_effect_language.pdf
    • https://cdn.shopify.com/s/files/1/0434/6180/4198/files/gegutikezotetelaxoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/adjoint_of_4x4_matrix_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/91136305935.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/putigorurexelapeka.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/ausable_chasm_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/igcse_biology_complete_notes.pdf
    • https://cdn.shopify.com/s/files/1/0449/5595/9464/files/ielts_writing_practice_tests_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5621/files/aerated_concrete.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_off00006538.bin
3efc1fc2f6b30355cc7e4ced711b0f2d3f8bfaa310ac1892d08e95df1fc27c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6538 5220 bytes
font_01_sfnt_off000076f6.bin
296e75941dbe95e29d4facf68cd7f7830bc7727787bb5ba23e9323160d870fd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F6 10488 bytes

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