Malicious PDF — malware analysis report

Static analysis result for SHA-256 808830fdf8016f51…

MALICIOUS

PDF

40.6 KB Created: 2020-08-20 11:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7203cfefe6b6f9dad6e9079aa7fbe72c SHA-1: 690d67b7701e46e603c314a430ee35bad2239fde SHA-256: 808830fdf8016f511c51b2f39c10577472a8effd849ad8b3cfeb69ea60581fc5
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain. The document body, though heavily obfuscated, contains the text 'Idioms worksheets for grade 5' and the malicious URL, suggesting a lure to disguise malicious redirection as educational content. The presence of numerous links indicates a link farm SEO strategy to obscure the malicious destination.

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.ru/pify?keyword=idioms+worksheets+for+grade+5
    • http://files.chaku.com/uploads/1/3/1/6/131606046/6223546.pdf
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/anomia_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/9823315232.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/kuvewutiradudugajuku.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/jufiwabumib.pdf
    • https://cdn.shopify.com/s/files/1/0440/5395/4725/files/vegipa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/atoms_elements_and_the_periodic_table.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/pradeep_biology_class_9.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/jizavojejugejisotinupof.pdf
    • https://cdn.shopify.com/s/files/1/0428/5975/7734/files/nijedazavizop.pdf
    • https://cdn.shopify.com/s/files/1/0439/4162/6011/files/24523255131.pdf
    • https://cdn.shopify.com/s/files/1/0435/8494/6333/files/piporejikekewunebuvo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/78834091201.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/regrouper_fichier_pdf_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1949/files/zesevenipiwegasabo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0336/0926/files/dusexojanatolix.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_off0000608f.bin
32177f16f2c3d06e9503f460fc37150a3a7600fad36778fc34e2e011e8d085c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608F 5504 bytes
font_01_sfnt_off00007340.bin
41ce41df1e6cd1710a73c7d10c8b2afa1b385190eb746a4886287f55d1654207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7340 10008 bytes

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