Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fc4b465152627c…

MALICIOUS

PDF

36.1 KB Created: 2020-08-31 10:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a05b25abe79ef2c190e863610ad4aac SHA-1: ce29cccac743dd0febde6e6c0fb52acfbe4de5c4 SHA-256: b7fc4b465152627c42c21a7580b20253a8c8a75b5137c0a8acfc2c6dfa874ec3
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=make+your+own+handwriting+worksheets+paragraph, which is flagged as malicious. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning to attract unsuspecting users.

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=make+your+own+handwriting+worksheets+paragraph
    • https://static.usrfiles.com/ugd/b8c837_448da653320e434d9652c41205afd22a.pdf
    • https://static.usrfiles.com/ugd/09273f_857d27cce6754cbeb8de16b39d7b4e73.pdf
    • https://static.usrfiles.com/ugd/b8c837_42e1384639084a63aabb4bc8a5e5322d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a712e25435b7489c98a739a81709f9b6.pdf
    • https://cdn.shopify.com/s/files/1/0427/6997/3415/files/liberalismo_politico_y_economico.pdf
    • https://cdn.shopify.com/s/files/1/0433/3466/4347/files/division_of_decimals_worksheets_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • https://cdn.shopify.com/s/files/1/0437/1084/1000/files/38255023302.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd93cce88b86421d843d3d98f494e62e.pdf
    • https://static.usrfiles.com/ugd/06497e_a77a0a744573433caa911cbeb9313afe.pdf
    • https://static.usrfiles.com/ugd/c33cdb_d4195f7261f54d38b41653f3028be771.pdf
    • https://static.usrfiles.com/ugd/b8c837_09ff9eee10534719a34530a46cfcff34.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/difexed.pdf
    • https://cdn.shopify.com/s/files/1/0429/0294/5959/files/82192384328.pdf
    • https://cdn.shopify.com/s/files/1/0438/3899/6642/files/gujenigubafokaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8577/4491/files/absceso_pancreatico_tratamiento.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_off00004f1b.bin
390dd8407e9404780b9a6c553ead6521f7b5ac51f66e6fd26c0d45a9840926ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F1B 5452 bytes
font_01_sfnt_off000061c8.bin
510c4cb30996053c60e52e8f651d2bc0737aa1055a618138f0768edd598861bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C8 9872 bytes

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