Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ad8aa0600150f5…

MALICIOUS

PDF

50.0 KB Created: 2020-08-29 08:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 045d886571f9570be29fc6c50666c1c8 SHA-1: a4d0aaa75752a2b9ca4726503a6447331313a9a6 SHA-256: 97ad8aa0600150f568028c5b5bbca5e7a4bed6874fe5a4a615902dd645bb86f2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Plural of nouns worksheet for grade 3' and the malicious URL, suggesting a lure to disguise malicious activity. The presence of a link farm heuristic further indicates an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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.ru/wix?keyword=plural+of+nouns+worksheet+for+grade+3
    • https://static.usrfiles.com/ugd/b8c837_a7e2fad02e034199adb1bbf2a3901639.pdf
    • https://static.usrfiles.com/ugd/b8c837_3fc75fb2f3944d28a06cd18ec474751e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7e4032911c447a1b1c289acb84cc05b.pdf
    • https://cdn.shopify.com/s/files/1/0457/7486/4550/files/welozoxekegazul.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/xanimekololipokuvasob.pdf
    • https://cdn.shopify.com/s/files/1/0466/3377/9365/files/biwesajodavoxerakurosekuw.pdf
    • https://cdn.shopify.com/s/files/1/0440/7286/1848/files/jovifigak.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/tell_me_about_yourself_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/lewobipexajiful.pdf
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/bad_company_2_player_count.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a08208f7fbd455ea3d34528689ae620.pdf
    • https://static.usrfiles.com/ugd/b8c837_807a84efb84e4182b982a49ea297c8d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1a357972d654b30a6875ce4de228798.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a6e49bd056343b98de48587020d11e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c41dc75589a48ed94d2cb00558bd87d.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006428.bin
24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6428 6588 bytes
font_01_sfnt_off000074a2.bin
3eace9c01cf451fa9472b1d6b748d2943e911782ff18c91402d3e1516b6c79f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A2 5324 bytes
font_02_sfnt_off000086c6.bin
719dd0259c37aefddc2776037b5895c6eed7d27ec5c84ceb6b65d3ff463f35d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C6 11312 bytes
font_03_sfnt_off0000ac49.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC49 4324 bytes

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