Malicious PDF — malware analysis report

Static analysis result for SHA-256 832c4151decb5c2b…

MALICIOUS

PDF

59.5 KB Created: 2020-08-30 20:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c19904e7a1db9f8273e44924e937832 SHA-1: c83b9a70f4f9833003317e4b3c1dcd7046b2cfbf SHA-256: 832c4151decb5c2bc9e015e6eef36d1d937c89223239442ad0a2dc620d27f92f
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it's a malicious redirector. One of the primary links, 'https://ttraff.com/wix?keyword=tanenbaum+operating+system', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the document's purpose is to lure users to malicious sites.

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/wix?keyword=tanenbaum+operating+system
    • https://static.usrfiles.com/ugd/804ff6_c16a11a820e0489992f7a7b419e57b7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bedf3ff08ab343cea19c83c960407353.pdf
    • https://static.usrfiles.com/ugd/b8c837_924976c92036418caa81c284af223ef3.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/xasuzogabozu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6044/2774/files/fekozejofaweb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/godikuka.pdf
    • https://cdn.shopify.com/s/files/1/0429/5278/6074/files/12553647319.pdf
    • https://cdn.shopify.com/s/files/1/0433/9692/3543/files/law_dictionary_english_to_urdu_free_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_72ab2368b6d64f46814886f59c0a3304.pdf
    • https://static.usrfiles.com/ugd/b8c837_c773afb0a1c040b3abcb07471c7f7c08.pdf
    • https://static.usrfiles.com/ugd/b8c837_61bd09aa55164e8187b767f01e3b8b5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_68c779775dc84d89981327673fac6f1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b291d8e5287540a7a20338fd5a39b0c9.pdf
    • https://static.usrfiles.com/ugd/cafc24_2fb2eadb46da48d997859de2682b291d.pdf
    • https://static.usrfiles.com/ugd/87a178_7f253e94e7964dbabc921f5498b7a2b9.pdf
    • https://static.usrfiles.com/ugd/6da380_80d61e4924a74f39817fceab3998ce94.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_off00009d8d.bin
aee6e8a83a22bc296d7f4b1d984447f5cd017b596263109be57bbca9a6f5520b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8D 5300 bytes
font_01_sfnt_off0000af7c.bin
f11c9a319563e7d660d549915876975c19a843373cac70a268d6ed408e389a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7C 16364 bytes

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