Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a52a28388ea1127…

MALICIOUS

PDF

40.2 KB Created: 2020-08-16 13:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcee7d995a2ab741ecfe1b6b396547d1 SHA-1: e8eda904d196417de4285eefa7bf27620b5cb86b SHA-256: 6a52a28388ea112743b61ecafe0427b28e0c27da5df2768a4acfc6596bd8d694
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with 30 external PDF links, many of which are SEO-themed, and one link points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the search query 'Osceola county school calendar 2020 pdf' and the malicious URL, suggesting a lure to redirect users. No scripts were extracted, but the PDF structure and embedded links indicate a phishing or redirection attempt.

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/wb?keyword=osceola%20county%20school%20calendar%202020%20pdf
    • http://files.hadasaron.com/uploads/1/3/1/4/131437513/9566478.pdf
    • http://wesavo.eeborton.com/uploads/1/3/1/1/131164110/gexavogo.pdf
    • http://porobupek.baconscribe.com/uploads/1/3/1/4/131437296/2760ee10ec983.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/general_agriculture_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0293/6992/files/27017987172.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/form_reg_227.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/ninipomotonegij.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1338/files/gobelojovadadozofadurifur.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/blank_sheet_music_notebook.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/43796258181.pdf
    • https://cdn.shopify.com/s/files/1/0431/7714/8571/files/creative_mode_terraria.pdf
    • https://cdn.shopify.com/s/files/1/0437/3128/8218/files/boygiri_full_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/kuxobuzapiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0321/files/bajegerofatevivolugovujoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/pezokiwefozaruvutar.pdf
    • https://cdn.shopify.com/s/files/1/0438/4754/9088/files/a_sibila_agustina_bessa_luis.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dfe.bin
f879ba54171f4619fd53c3d973ba8cc10aa612738bb446dac632a65c59b35190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFE 5648 bytes
font_01_sfnt_off00007129.bin
978a2131ae3cf101ebd9aa9f1149817d2b9e1f35c96622b682777e98005d0408		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7129 10184 bytes

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