Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f9a5652ec4d342…

MALICIOUS

PDF

36.1 KB Created: 2020-08-06 01:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 668965d0f3862762755215c5ac0df07c SHA-1: 3362d0c78a971f76ce9254fe40fbdc470be5cd0e SHA-256: 55f9a5652ec4d34286bc7b30e0246ec2d32af0223f820a089eb228b47206be95
120 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains the text 'Reading vocabulary development 3 cause and effect pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous external PDF links further indicates a link farm used for SEO poisoning or traffic generation to malicious sites.

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.com/pify?keyword=reading+vocabulary+development+3+cause+and+effect+pdf
    • http://files.susanaramirez.net/uploads/1/3/1/4/131407424/jikutirobogov.pdf
    • http://files.toadstudioonline.com/uploads/1/3/0/8/130874123/cbc39ff53d.pdf
    • http://kunizupur.gtectrain.com/uploads/1/3/0/7/130739457/4bd9dd2649acda8.pdf
    • http://files.rosemarygallagher.com/uploads/1/3/0/8/130813373/2cd2a741464.pdf
    • http://gemawab.tracy-buchanan.com/uploads/1/3/2/6/132683014/9073841.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/93902843979.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/43266173385.pdf
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/88450071831.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1120/files/6._snf_sosyal_bilgiler_testi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/gauge_girl_training.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/primary_medical_certificate_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/26406551005.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/80724734423.pdf
    • https://cdn.shopify.com/s/files/1/0428/1935/4791/files/berean_study_bible_old_testament.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/86434716037.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/junakolabepe.pdf
    • https://cdn.shopify.com/s/files/1/0440/4396/0485/files/wenavumorudukujipe.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_off00004be7.bin
7767cb5978272097cd836cec5e7dcf92d83949debd50974f6583f5be341b78d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BE7 5948 bytes
font_01_sfnt_off00006025.bin
344dadef27f7d91bf6504700482724761b7423c152878f1e7dedf9e06d7f8d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6025 10264 bytes

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