Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fd53607bc49c91…

MALICIOUS

PDF

43.6 KB Created: 2020-08-21 20:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01672aeef24dc3b70981a0d28d6a9b25 SHA-1: c89cb4f14949c9d9e396cd1a20ab6a0733ba4c10 SHA-256: e3fd53607bc49c915f5d806b89583130af0cd70974af2d561903bc3a8dec9efe
150 Risk Score

Malware Insights

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

The PDF contains a large number of links to other PDF documents, many hosted on Shopify, which is indicative of a link farm. One of these links, 'https://ttraff.cc/pify?keyword=spring+boot+jasper+report+subreport', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious redirector URL and several benign-looking Shopify PDF links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=spring+boot+jasper+report+subreport
    • http://files.kathrynmwhitesel.com/uploads/1/3/1/3/131383837/nokap.pdf
    • http://buzot.musicwithlaura.com/uploads/1/3/1/6/131606490/zavetuduwisozekun.pdf
    • http://files.rsitoy.com/uploads/1/3/2/6/132695697/deboxabuku.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/bing_document_translator.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7863/files/degrees_to_radian_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/learning_management_system_admin_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/2423/7212/files/rodixotuxetaxajemerur.pdf
    • https://cdn.shopify.com/s/files/1/0431/2200/0029/files/xibizuraligosamabogunug.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/jariv.pdf
    • https://cdn.shopify.com/s/files/1/0440/3403/1766/files/icloud_windows_10_all_photos.pdf
    • https://cdn.shopify.com/s/files/1/0429/0193/0143/files/wopagosaxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/rijojezamogubawevedijola.pdf
    • https://cdn.shopify.com/s/files/1/0448/2102/0834/files/pdf_in_word_umwandeln_mac_os_x.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/dutumasevarobolabimoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/acca_f9_december_2013_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/88593733594.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_off000062df.bin
4bc8f17643a852075f1b025967d8cdbd32e769b2936234cb72b82b0aa4586c18
pdf-font-stream PDF embedded font (sfnt) at offset 0x62DF 5272 bytes
font_01_sfnt_off000074d4.bin
726c8e55c6e0e5c5443e7e9c4f3b7fe7ac1ad085d0210b99425b2f09ad8b77fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x74D4 13864 bytes