Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8da2018b0a8512a…

MALICIOUS

PDF

44.3 KB Created: 2020-09-06 00:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45fd6d66b1e86f9a189bd4ac05a77827 SHA-1: 40e4ccf373956282d5a895fd3114e315c5f184d4 SHA-256: b8da2018b0a8512a6f4b4342bda8b6593c1cccb5d8342c52d62fe990ab40b48f
120 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify and static.usrfiles.com domains, likely for SEO manipulation or to host further malicious content. One critical heuristic firing indicates a direct link to a known malicious redirector: https://ttraff.link/wix?keyword=improve+english+speaking+skills+ebook+pdf. The document body, though heavily obfuscated, contains text related to 'Improve english speaking skills ebook pdf', reinforcing the lure.

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.link/wix?keyword=improve+english+speaking+skills+ebook+pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7134/files/padelonizoraw.pdf
    • https://cdn.shopify.com/s/files/1/0435/8320/9631/files/kojibaku.pdf
    • https://cdn.shopify.com/s/files/1/0434/0160/9366/files/jujow.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/vijipojaredetobimej.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8518/files/bugezi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9449/8709/files/vubaxekinax.pdf
    • https://cdn.shopify.com/s/files/1/0437/8987/7405/files/biology_chapter_wise_neet_questions.pdf
    • https://static.usrfiles.com/ugd/87b9a8_eea0a3efbc0f472a8da77f5996649b97.pdf
    • https://static.usrfiles.com/ugd/963627_f04d21fc4932413092574a904c23a8a5.pdf
    • https://static.usrfiles.com/ugd/2ca09c_6b9902d50f3148ce9cbd2c7a8a7ed5b0.pdf
    • https://static.usrfiles.com/ugd/de3d83_f0ee6e6fa2cf42f394bfc7300cd98054.pdf
    • https://static.usrfiles.com/ugd/3aee12_5eeb4f5825704deb875624618d6efc33.pdf
    • https://static.usrfiles.com/ugd/18122d_7d47dae178484e14af0a166aef07fc77.pdf
    • https://static.usrfiles.com/ugd/2d797c_e9a4fe3a49d4471a947f9d38f338b67d.pdf
    • https://static.usrfiles.com/ugd/3d0627_3e19118570844e259788e6d04e032053.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_off00006c77.bin
9296df23f376e1c7ab200aaa5e9a83e1dcfe357af5ff052ef98ac1882ea32dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C77 5656 bytes
font_01_sfnt_off00007f8b.bin
4421c1c296d9a0f768c63fe5d5435e49fe151af08c7185529bf8e2cf37d5d101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8B 10712 bytes

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