Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa687b44d94cb583…

MALICIOUS

PDF

45.3 KB Created: 2020-08-22 02:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01492bbcc6df442643e5873c234e3de4 SHA-1: a3ade37222dbea5dfabbce62494cf705b387712d SHA-256: fa687b44d94cb583123d16fdf9ad53e01aec9712f836848fdd6128092dbd842e
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector link to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to multiplication worksheets, serving as a lure. The presence of a link farm and a malicious redirector suggests an attempt to drive traffic to malicious sites, likely for further exploitation or malware delivery. 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.ru/pify?keyword=multiplication+worksheets+pdf+1-+12
    • http://nerejaz.breaknsave.com/uploads/1/3/1/4/131453301/tasixegizuvijozu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/77187570934.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/bocadillos_menu_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/59225541403.pdf
    • https://cdn.shopify.com/s/files/1/0432/3439/4276/files/healthy_carbs_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/tejupilevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/madejobepurubelirosajuwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3847/2357/files/java_ee_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/71412838153.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/64323379261.pdf
    • https://cdn.shopify.com/s/files/1/0435/0397/6614/files/30548009815.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006490.bin
bcb4bc49d3759ad1fae51f1441902ac61bca7bb2ac275d2480142fda312a2585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6490 5500 bytes
font_01_sfnt_off0000775c.bin
3dddbfd66bed8a92fe8c73a2387e059d8b2d4ba431a40cee03e7eb953290a90c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775C 10272 bytes
font_02_sfnt_off00009a4c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4C 4324 bytes

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