Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a79267849278e0…

MALICIOUS

PDF

50.8 KB Created: 2020-08-31 06:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fa34df2122a8ccba79e8a0b93b0ca53 SHA-1: 2d14fb0462ecc063afc796853d8af79e4f977372 SHA-256: e4a79267849278e04b4d41e3ae18cdd73cacf99138b3c644f47d874d3dd019c9
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to statistical sampling. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning tactic. No scripts were extracted from this sample.

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=formula+para+sacar+la+muestra+de+una+poblacion+peque%25C3%25B1a
    • https://static.usrfiles.com/ugd/0a0016_0e175d5f8e8347bb98429bb0b49d314a.pdf
    • https://static.usrfiles.com/ugd/9f6a24_4eb5087cf61649b18adc5bf1ddb19ec3.pdf
    • https://static.usrfiles.com/ugd/ae059d_6de082cd944f495cb8bf62f261e8bfbb.pdf
    • https://static.usrfiles.com/ugd/d216cb_8308ad07a0d9422cb0aba352f3ba0514.pdf
    • https://static.usrfiles.com/ugd/bca722_f1ff59be9da347f4817b7e2e32e3a0df.pdf
    • https://cdn.shopify.com/s/files/1/0438/0485/2386/files/how_to_reset_google_wifi.pdf
    • https://cdn.shopify.com/s/files/1/0448/0181/8781/files/supporting_teaching_and_learning_in_schools_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/boxhead_the_rooms.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7056/files/bootstrap_3_form_validation_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8841/files/xitovomemikinakuz.pdf
    • https://static.usrfiles.com/ugd/850f07_a67ddf97bf8646c085aecf566c61f327.pdf
    • https://static.usrfiles.com/ugd/badafb_1f53bceab8f24e58a5183aa355f07b3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf749022ce3b4451b87ed439770c196e.pdf
    • https://static.usrfiles.com/ugd/cb5dea_eef6ef08299c4f50be452b5bf818f749.pdf
    • https://static.usrfiles.com/ugd/b8c837_13cec9d0f67f43a7acac605aaaaa5d1e.pdf
    • https://cdn.shopify.com/s/files/1/0433/0310/8768/files/gusafijekijexat.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/ssh_key_file_permissions.pdf
    • https://cdn.shopify.com/s/files/1/0461/7814/0323/files/18491856312.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/
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/ssh_k

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064bc.bin
a20bb4f408d8f784ad73c3448e4c5f25c27999cb50838481ad122ee355a0e39f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BC 3040 bytes
font_01_sfnt_off00006fa7.bin
850053405875171962017b9da9e514ea40eb222cb88992ec66e11bd94ea2789f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA7 5652 bytes
font_02_sfnt_off00008278.bin
57113f211ac4088c854fa2b6c10426211f7f1f01a1f56af76ab89c51ec07f621		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8278 10572 bytes
font_03_sfnt_off0000a50c.bin
c00f55c8a23f8fc12478e3e4ea1bac713d25e4d1dd6e1e4bb5c667610ba6b2cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA50C 16192 bytes

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