Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2b62cbf68ef262…

MALICIOUS

PDF

50.6 KB Created: 2020-08-14 09:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbe3b774a62c060ffbba5aeed9a5cb17 SHA-1: ecfe2702bb6ae2887721196f8dafc535e84439f7 SHA-256: bd2b62cbf68ef262332b088180a2e6dc9c77019bb69ca65fb8fc51ba68ed6996
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting a social engineering attempt to drive traffic to malicious sites.

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=bringhurst+elements+of+typographic+style+pdf
    • http://files.fancycanary.com/uploads/1/3/0/7/130740221/1730308.pdf
    • http://bafipos.troop374raleigh.com/uploads/1/3/2/6/132681556/nusadapimob_neniwobarug_mijivu.pdf
    • http://bebov.animclass.org/uploads/1/3/0/8/130814328/juzujabini.pdf
    • https://cdn.shopify.com/s/files/1/0431/8566/8255/files/concept_of_human_resource_development.pdf
    • https://cdn.shopify.com/s/files/1/0434/1347/1384/files/marorelufafivami.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/sobup.pdf
    • https://cdn.shopify.com/s/files/1/0433/7837/6853/files/zixos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/totavari.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6707/files/tabodowivitexozowevo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4836/8288/files/bd_chaurasia_general_anatomy_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/rewufinatewesibam.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/gewinir.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/20957251017.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/wosimanitela.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_off00008733.bin
bd00a5cc2b99ed08687fb4f07c180001f85c8472293635d8863d8d334981729f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8733 5720 bytes
font_01_sfnt_off00009a89.bin
560972ed3d32e3b63c9652aec18b8d219ce587e1b260156b1460c88c9761f1f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A89 10096 bytes

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