Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0967406c9f2a39…

MALICIOUS

PDF

43.4 KB Created: 2020-08-24 05:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 979d19b6afa805c9ca09828054e4cde4 SHA-1: b61813fb57ddaa64ea0ae533d5d783703d85fbec SHA-256: 8d0967406c9f2a390de241323cc8e7cd0212598430bd9cb45ba5a55274d1c358
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=hard+story+riddles+with+answers', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting it's the primary lure. The ML classifier strongly supports the malicious nature of this PDF.

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=hard+story+riddles+with+answers
    • http://falade.eibenteaching.com/uploads/1/3/2/6/132682974/dujakubatir-rawemeso-sawula.pdf
    • http://moside.massageandfacialorganics.com/uploads/1/3/2/6/132695535/30c1c3bb.pdf
    • http://jawige.katherineorchard.com/uploads/1/3/1/4/131437949/mutetujotojisatu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/jasper_reports_server_api.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/31062794961.pdf
    • https://cdn.shopify.com/s/files/1/0445/4517/9807/files/asos_maternity_dress_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/5041/8847/files/98758428516.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/cofferdam_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0433/7480/5148/files/pokemon_ruby_walk_through_walls.pdf
    • https://cdn.shopify.com/s/files/1/0450/1274/6390/files/dodefokivakabefe.pdf
    • https://cdn.shopify.com/s/files/1/0429/5406/4028/files/bluetooth_windows_7_32_bit_dell.pdf
    • https://cdn.shopify.com/s/files/1/0455/3277/4565/files/catechesis_tradendae_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/gitagu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2135/1587/files/28492871626.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/puruduzakep.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_off00006c4b.bin
b539dbeeabc180533e7909df8404becd7c22e6d906c221589e17b201888d0437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4B 5068 bytes
font_01_sfnt_off00007d90.bin
48c20dff7e5b023e5f941400db89bac8b96cd91b2f92b35a96e7d5b53b2d9f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D90 10332 bytes

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