Malicious PDF — malware analysis report

Static analysis result for SHA-256 98174a81c2c5e3a6…

MALICIOUS

PDF

52.6 KB Created: 2020-09-01 08:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbcdbec0164d486699d29c2205ecc6ff SHA-1: ec19ef3afeabaa9bc6f39ef21fe1bf2e02699103 SHA-256: 98174a81c2c5e3a6350ed34d0a53aa56d5a85d438644ce9323fc992b69c4c903
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, characteristic of a link farm. One of these links, 'https://ttraff.ru/wix?keyword=mla+writing+format+guide', is flagged as a known malicious redirector. The presence of a link farm and a malicious redirector strongly suggests an attempt to lure users to malicious sites. No scripts were extracted, and the document body is heavily obfuscated.

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=mla+writing+format+guide
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/natukuwigepenelavakexog.pdf
    • https://cdn.shopify.com/s/files/1/0462/7156/1890/files/brilliant_connect_app.pdf
    • https://cdn.shopify.com/s/files/1/0446/2955/7411/files/enter_the_gungeon_ruby_bracelet.pdf
    • https://static.usrfiles.com/ugd/b8c837_0af06bc528704f598aac5c91b9f3948a.pdf
    • https://static.usrfiles.com/ugd/238140_b96dacb2dbdd4fd287ae398794ed7fd2.pdf
    • https://static.usrfiles.com/ugd/4f270c_dc7a6e713b3842b0af45db82e441ebd8.pdf
    • https://static.usrfiles.com/ugd/90c678_3c092c7ccebc4307a9ed251d50adb96b.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7614/files/attestation_de_formation_informatique.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/kapobusumijasibikujafino.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/61642873197.pdf
    • https://cdn.shopify.com/s/files/1/0432/6532/7262/files/ny_driver_s_license_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/55335362996.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/30546594700.pdf
    • https://cdn.shopify.com/s/files/1/0430/0062/7363/files/38549584185.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_off00008fa0.bin
f519af0b4b593575f349feb2d495f32982933deeb6cffa6064876945cf6aa89c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA0 5148 bytes
font_01_sfnt_off0000a12b.bin
ab3649b6d9aa979692e243b3c2a3c57865a610d9e5ba2d6fb036d1561c75eeaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA12B 10812 bytes

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