Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fc5fbeb0c937a2…

MALICIOUS

PDF

38.2 KB Created: 2020-09-17 14:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7eac62b41a06814330f674399249b604 SHA-1: 1551c66cf2226dccac5ee1a54fd286436c6f33a1 SHA-256: b3fc5fbeb0c937a2a240f2752857696356c946b6ccfe5f5ac83200ac8381cc6e
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/wb?keyword=triangle%20angle%20sum%20theorem%20and%20exterior%20angle%20theorem%20worksheet%20answers'. This indicates the document is designed to trick users into visiting a potentially harmful site by masquerading as educational content. The presence of a large number of external PDF links further supports the SEO link farm heuristic, suggesting an attempt to manipulate search engine results or distribute malicious content.

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.com/wb?keyword=triangle%20angle%20sum%20theorem%20and%20exterior%20angle%20theorem%20worksheet%20answers
    • https://1d405bfd-d42a-4189-96cf-3156639c2f80.filesusr.com/ugd/71fd01_853d679b76f149ee9e557b4f94a9946f.pdf?index=true
    • https://4adf1e0b-90fa-469f-b8e9-1f698b47b25f.filesusr.com/ugd/9c8fb9_cb877cc0accb4c30bb1904532f4083a0.pdf?index=true
    • https://1b52364e-80f1-47e8-8038-0c539044465f.filesusr.com/ugd/e49726_eeaf18764d74423385aa98b1722f4281.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0440/3855/3765/files/8218225928.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/neonatal_hypoglycemia_guideline_thai.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/lamunate.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/jatitiguke.pdf
    • https://cdn.shopify.com/s/files/1/0429/5992/9503/files/gazibakinifibo.pdf
    • https://cdn.shopify.com/s/files/1/0441/0854/6200/files/forrest_gump_meme_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/atys_pm_socomec.pdf
    • https://cdn.shopify.com/s/files/1/0437/6399/0686/files/contoh_rpp_biologi_sma_kurikulum_2020_revisi_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/back_to_the_future_hoverboard.pdf
    • https://cdn.shopify.com/s/files/1/0437/8335/6565/files/43988118195.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/beckman_coulter_au680_user_guide.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_off00005767.bin
657769f242cd503b41f68da5db32c2b7971a947d64af0fe9ca859f1a786b40e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5767 5412 bytes
font_01_sfnt_off000069b1.bin
09e362082fbd9abcc8bfb82ebc8e7dfd05f49b6fe1040ad5ecdf86f2ecfad181
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B1 9860 bytes