Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4144f98de214289…

MALICIOUS

PDF

42.8 KB Created: 2020-08-31 06:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ee43fc8705298cdab4427496ff3c371 SHA-1: 3b1b9a607689e38fc3595ee9a425631f0bb03228 SHA-256: b4144f98de214289ad0f1914360156c0920dee9f78e4ca63f4769c8a43dbef1e
120 Risk Score

Malware Insights

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

The PDF file contains a link disguised as an educational worksheet, which redirects to a known malicious domain. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a malicious redirector. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which point to benign content, suggesting a tactic to obscure the malicious link among many others. The primary malicious IOC is the redirector URL.

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.me/wix?keyword=law+of+conservation+of+energy+worksheet
    • https://static.usrfiles.com/ugd/afe78f_8e6952d074c24cd885b6be5c15f20762.pdf
    • https://static.usrfiles.com/ugd/b8c837_a549923e13cf4248b8a2f4a604685c78.pdf
    • https://static.usrfiles.com/ugd/764aaa_a7552be26ae04732989246dbdd5983b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_7859c7c65faa4e118d26c53da8b0fea7.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7556/files/bsc_nursing_admission_form_2019_mp.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/addition_and_subtraction_with_regrouping_worksheets.pdf
    • https://static.usrfiles.com/ugd/850f07_823f70ee66bc48908458f25f7fa2b184.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_e27dd3f1a6b34d7c8ba3185071a8fb03.pdf
    • https://static.usrfiles.com/ugd/735424_b7babd4b53984d77b5a91c2c036d309b.pdf
    • https://static.usrfiles.com/ugd/e2f197_3d0aa9ae993b47ccaf2f09397b0b0731.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/tumoganitatekewal.pdf
    • https://cdn.shopify.com/s/files/1/0431/1924/7514/files/39870763210.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9528/files/wow_classic_priest_leveling_guide_discipline.pdf
    • https://cdn.shopify.com/s/files/1/0438/5082/5893/files/bad_blood_remix_song.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_off00006840.bin
4ffb9e8bb300e1e9b591b4953cdd20a0a55686fecff8883adf972dde71e118e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6840 5368 bytes
font_01_sfnt_off00007aa4.bin
39fdf7b097a4197050223f6294ceba345599c5d59e4476e22f4e9d08ee45bdd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA4 10364 bytes

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