Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbd4039e6f208db…

MALICIOUS

PDF

60.6 KB Created: 2020-08-20 01:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f1f1a595a82d069c284da3e15c37650 SHA-1: f55fe91e5eb971c39dc2bb41ebf9ef39a824e253 SHA-256: 3cbd4039e6f208db56f99ae37d860bf1f386fa45dd0ab2f17ca388f23cfe3fd2
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, disguised with text related to "Animal farm student journal answers". The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=animal+farm+student+journal+answers
    • http://files.pocketswine.com/uploads/1/3/2/8/132815882/be4e402.pdf
    • https://cdn.shopify.com/s/files/1/0431/8930/5506/files/tujomujolefo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9195/1769/files/mifito.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/80500638416.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8316/files/polaris_ranger_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/7456/5784/files/accountancy_guide_for_class_12_english_medium.pdf
    • https://cdn.shopify.com/s/files/1/0436/8501/9801/files/wezatu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9926/8003/files/jojenifivagun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84302935330.pdf
    • https://cdn.shopify.com/s/files/1/0448/9697/7051/files/spoken_english_book_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0432/0077/4308/files/11722111719.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9639/files/28446391425.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_off0000a124.bin
54ef413800d0fd00d962e8088d66fa85c07d9e09c5a2e8ce1ae84327154658f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xA124 3532 bytes
font_01_sfnt_off0000adc7.bin
9ad1ac23dbd8c047af55394e583d3a3ce1b2c13342837952a6b91bed8c193e7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xADC7 5208 bytes
font_02_sfnt_off0000bf6a.bin
3d8175250c51597e99aa12dacbe247476765401b36b8f7308f594840c96c1eff
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6A 11192 bytes