Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2c5b2d255272e0…

MALICIOUS

PDF

41.5 KB Created: 2020-08-28 06:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5fc6ecddb2e169511aa9a6fa0fa0ad8 SHA-1: 2cdbf0745ac626087dcc53bb8957e76c6ea0e33f SHA-256: 8a2c5b2d255272e0d55d363fd4df442c09cf054c9011ff6257b98e7270311841
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=shapes+worksheet+activities+for+kindergarten', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating the primary intent is to redirect the user to malicious infrastructure. No scripts were extracted, but the presence of the malicious redirector and the link farm heuristic strongly suggest a phishing or redirection attack.

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=shapes+worksheet+activities+for+kindergarten
    • http://files.pictonlittletheatre.com/uploads/1/3/1/4/131436981/rafimixexegitit.pdf
    • http://rotaxoj.lauramnutrition.com/uploads/1/3/0/8/130814328/xiwirite.pdf
    • http://files.moonlightweddingservice.com/uploads/1/3/1/1/131164520/sebominex.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6503/files/72979386727.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1695/files/35420672731.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/dakek.pdf
    • https://cdn.shopify.com/s/files/1/0449/3488/9627/files/description_of_a_person_essay.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/49887463057.pdf
    • https://cdn.shopify.com/s/files/1/0440/8632/9509/files/memo_template_caf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6314/files/kumamapakarumopuderolajak.pdf
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/ruxuzeguzitu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1706/files/mabidakaduwa.pdf
    • https://cdn.shopify.com/s/files/1/0440/4278/0837/files/all_words_in_english.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_off000061df.bin
cd7cc144fa2a5bb7f962d4941bbc8760cd148c9538383455047ef423f0c3f7e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DF 5704 bytes
font_01_sfnt_off0000755e.bin
533ebd4886fff4b9d708578c8c6786bbc6023a62aee7c6546d895a4580fb3c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755E 10412 bytes

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