Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b81ef296ea2d99f…

MALICIOUS

PDF

42.5 KB Created: 2020-08-14 15:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5adcf4f56c5bab0c686a7e0b3f49affd SHA-1: 38973d8f4913180d7b7e070fc0c774165ca3db93 SHA-256: 3b81ef296ea2d99faba03dbe57d824e58dc6265843c256242c622770478993c5
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. The primary URL, 'https://ttraff.ru/pify?keyword=picture+story+worksheets+for+grade+5', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to educational content and the malicious URL, indicating a lure to potentially malicious content.

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=picture+story+worksheets+for+grade+5
    • http://files.seedsforthejourney.com/uploads/1/3/1/3/131379306/vokijelikurat.pdf
    • http://files.jupitersdream.com/uploads/1/3/0/7/130775245/4480888.pdf
    • http://nekoxeliv.staeblestudioa.com/uploads/1/3/2/8/132814900/8929853.pdf
    • http://files.wild-tiger.org/uploads/1/3/2/6/132695397/4662858.pdf
    • http://files.wild-
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/rupor.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/64462039419.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/anlage_kind_2020_ausfllbar.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6371/files/29806831721.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/maretiru.pdf
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/jivasefawetu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0278/0057/files/uga_history_exemption_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/binomial_probability_distribution_examples_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0437/8257/0136/files/luwabukina.pdf
    • https://cdn.shopify.com/s/files/1/0433/6713/7438/files/74599286332.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/xuvazobadebomosux.pdf
    • https://cdn.shopify.com/s/files/1/0434/2572/6614/files/btech_malayalam_movie_whatsapp_status_video.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_off00006689.bin
e91e5b949892e537866600b6349eca063e133c2d3f2c55d7269bc23dc2ecb30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6689 5636 bytes
font_01_sfnt_off000079c8.bin
a397e4d261e09b98fa429fa992bb59a23a09f36c654f5a649f86911087cc96de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C8 10176 bytes

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