Malicious PDF — malware analysis report

Static analysis result for SHA-256 e147a47f15745ce2…

MALICIOUS

PDF

34.4 KB Created: 2020-08-08 19:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11f64a1184d9308d48d0981d7977c044 SHA-1: 7be08ea994afc81605f7f07ffc6bf3b365c8efb8 SHA-256: e147a47f15745ce28611e521d4d7576447ebf131fffdda6502b84ea98effce03
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 `https://ttraff.com/pify?keyword=new+cambridge+advanced+english+teacher+s+book+pdf+download`. This URL is part of a link farm designed to appear as a legitimate PDF download for an English teacher's book, but it redirects to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=new+cambridge+advanced+english+teacher+s+book+pdf+download
    • http://files.choteautlc.com/uploads/1/3/2/6/132681992/jelinomuvene.pdf
    • http://files.arkspringbaptistchurch.net/uploads/1/3/2/3/132303010/8741469.pdf
    • http://files.mypointstoponder.com/uploads/1/3/2/6/132682303/8523028.pdf
    • http://files.softutor.com/uploads/1/3/1/4/131453996/gilisepuzip-wikakeniruma-letunusudapaga-sepis.pdf
    • http://files.backcountryexplorers.com/uploads/1/3/0/7/130775934/vevewadimawukasomox.pdf
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/zetafutanovelijiteni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9441/files/troy_bilt_6000_watt_generator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7313/2954/files/wamunafudumarofelimel.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/25710333353.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/carcinoma_de_celulas_no_pequeas_de_pulmon.pdf
    • https://cdn.shopify.com/s/files/1/0448/4320/4765/files/how_to_delete_columns_in_google_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/sierra_bullets_reloading_data.pdf
    • https://cdn.shopify.com/s/files/1/0436/2108/9444/files/alphabetical_list_of_chemical_elements.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/81801572498.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/lasupagagi.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_off000045cf.bin
c069a6b0328700d18d2b6d8761e144376102aa7383734767603fafcb498a32c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45CF 5892 bytes
font_01_sfnt_off000059c9.bin
954e91b067567c57e8853a9f2ee62d7375fe3acd65e05a8ca83a0f9a8990c92b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C9 9600 bytes

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