Malicious PDF — malware analysis report

Static analysis result for SHA-256 b725022b235e1de2…

MALICIOUS

PDF

43.5 KB Created: 2020-09-01 13:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9fd31c74bb3226334e57323ed38b8fa SHA-1: 7456468edd0ea69495ad0876e36d81f620c143ca SHA-256: b725022b235e1de226389f8c20da552c784c2ded9bf1e965e0552e00e4af2454
150 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it's a redirector link. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The primary malicious URL identified is https://ttraff.ru/wix?keyword=balupu+movie+audio+songs+ing, which is likely used to redirect users to further malicious content. The document body appears to be corrupted or heavily encoded, preventing a clear understanding of its lure.

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=balupu+movie+audio+songs+ing
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/fejijasewoxavumagizezupi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7466/7164/files/12474645156.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6578/files/chn_8_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/gojelidofugo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/newakuvezipojulak.pdf
    • https://cdn.shopify.com/s/files/1/0444/1980/9447/files/cambridge_ket_exam_sample_papers.pdf
    • https://cdn.shopify.com/s/files/1/0428/6405/0332/files/big_5_personality_test_interpretation.pdf
    • https://static.usrfiles.com/ugd/9e53d4_933e8fa9357c4827b426d40ad206eed9.pdf
    • https://static.usrfiles.com/ugd/fb5067_8024c3ce5a7143dd8d14db00e067fbc5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed426657fc0c469bba22da7019b26597.pdf
    • https://static.usrfiles.com/ugd/12f4eb_75afbb19a59b428992c38eb7c43c5d5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_60e58ff5224a480da5784657af1b4e42.pdf
    • https://cdn.shopify.com/s/files/1/0468/9883/9714/files/descriptive_correlational_design.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9730/files/tijux.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_off000066f6.bin
d4703e3e70a93862fe222672bfc18752975572bd35c05debe12ba35a474457bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F6 5292 bytes
font_01_sfnt_off000078f4.bin
4f32c17bf629aecbe71320563cb115be6884a1a9cb4e5e86870fb9a4ddfa8efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F4 12368 bytes

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