Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ef35f0b7de883d…

MALICIOUS

PDF

44.1 KB Created: 2020-08-30 18:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8aeaacd4bb5526971e83c73ff668c63 SHA-1: 3d6c9f46189c70dd085c083e23ee7deb83fc2445 SHA-256: 87ef35f0b7de883d22e5317586de1ced69e7d2112f10f10a3710180ed8c3ab09
150 Risk Score

Malware Insights

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

The PDF file contains a direct link to a known malicious redirector. The document body, though heavily obfuscated, includes the same URL, suggesting it's intended to lure the user to a malicious site under the guise of technical support. The presence of numerous other PDF links, many pointing to Shopify domains, indicates a link farm strategy, likely to improve SEO for the malicious redirector.

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.me/wix?keyword=tecknet+wireless+mouse+troubleshooting
    • https://static.usrfiles.com/ugd/1decf9_7730403f288642c4b14f4cdab3928f2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b1a633001ce4af7bdc2582769e90779.pdf
    • https://static.usrfiles.com/ugd/4dd980_80e6ddadf100480f936763236a746b72.pdf
    • https://static.usrfiles.com/ugd/76de1a_de4c478c8c834aa0beaac89aab9213bc.pdf
    • https://static.usrfiles.com/ugd/724fb5_814ef86d8f0744ac9d35f8f5c9c6d3fc.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_7d253c3564fe4415bca63d827f0f731d.pdf
    • https://cdn.shopify.com/s/files/1/0451/8277/9541/files/garotozefobutafaxelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/arterial_blood_pressure_waveform_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0438/2703/6322/files/2003_ford_explorer_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7074/9861/files/historia_del_cartel_de_sinaloa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1354/4863/files/70716347633.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9861/files/lcsw_exam_nj_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/zorovoripe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5727/3237/files/magivasujamofomepeneb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061a8.bin
cb80e269b4c55f8119c5e55753d054b018f0b9dfdb52365cafbdcb431b559644		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A8 5128 bytes
font_01_sfnt_off000072fe.bin
5af7ba6f1993b12c582035f3c1598cd2018b7d2a8af4fbe7bd76b8e6fe969bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FE 10216 bytes
font_02_sfnt_off00009556.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9556 4324 bytes

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