Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c6ecf4f166d7aa…

MALICIOUS

PDF

54.3 KB Created: 2020-08-06 09:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab768c5ac96f8c14f20a302696e24094 SHA-1: 784a1582bd04c38d8fe9869db1debab3f8f040aa SHA-256: 31c6ecf4f166d7aab7e211bf27c238142cc433049684971c2d027c36a3c284e5
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'English story book free download pdf' and the malicious URL, suggesting a lure to download content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a link to malicious infrastructure, and PDF_SEO_LINK_FARM indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

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=english+story+book+free+download+pdf
    • http://files.hayhyer.com/uploads/1/3/0/7/130775084/631683.pdf
    • http://files.fishmougey.com/uploads/1/3/2/7/132741348/7028152.pdf
    • http://files.zackbacak.com/uploads/1/3/1/8/131856626/802f57bb9499b.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/basic_accounting_questions_mcqs_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/87347261761.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/34089736419.pdf
    • https://cdn.shopify.com/s/files/1/0437/9118/8117/files/dakenikebelajaxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0002/0635/files/raleki.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/78280077490.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8661/files/tinizelutewejokin.pdf
    • https://cdn.shopify.com/s/files/1/0437/4819/6513/files/css_reset_file.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/12066002427.pdf
    • https://cdn.shopify.com/s/files/1/0434/0996/5212/files/57178110873.pdf
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/the_new_oxford_picture_dictionary_english_spanish_free_download.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_off0000961c.bin
ff42542c74a771767c4ecc3a909e280754ae97fd4617aae1a0de90dc22266c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x961C 5656 bytes
font_01_sfnt_off0000a97c.bin
0935764de6a69232a6068df1341950e207d8bd5ba7aab95ee7f1f76b782de052		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA97C 10276 bytes

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