Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fbe8cc4c93d9e6…

MALICIOUS

PDF

39.0 KB Created: 2020-08-17 17:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a57b936ce9d376690ef1b847078a89f9 SHA-1: 4ed7e8b7e64f3a23f38848dc88530ffe74d7cc95 SHA-256: b4fbe8cc4c93d9e6864c68fb8be824da702149717b8d8cf0130f55167406bc34
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, disguised as educational content. The primary malicious URL identified is https://ttraff.cc/pify?keyword=7th+grade+math+questions+with+answers, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to educational topics and the malicious URL, suggesting a lure to trick users into clicking the link. No scripts were extracted from this sample.

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.cc/pify?keyword=7th+grade+math+questions+with+answers
    • http://files.meganmcgarrymusic.com/uploads/1/3/2/6/132695829/meragesa_zafamero_gedati_bidaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/1732/9064/files/18405097841.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3770/files/aprender_aperturas_de_ajedrez.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0374/files/41386240097.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1989/files/fejemebowunarimonulerezuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3740/0999/files/statistical_methods_for_the_analysis_of_biomedical_data.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/joribazox.pdf
    • https://cdn.shopify.com/s/files/1/0430/7822/1973/files/forexed.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/1200_bosquejos_biblicos_para_predicar_y_ensear.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/download_showbox_on_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/77384977625.pdf
    • https://cdn.shopify.com/s/files/1/0435/4995/0116/files/45568613593.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_off00005bda.bin
1d194230f3c180cc0597259455fb8901726cfbf506bd4d40fe19a03724e5d90a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDA 5408 bytes
font_01_sfnt_off00006e2c.bin
c38af6bdcc87b696f4620fc205601595eb4d52ba8cf61d73b7b501cb3a9cb5ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2C 9796 bytes

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