Malicious PDF — malware analysis report

Static analysis result for SHA-256 240c6fcfc4944647…

MALICIOUS

PDF

51.3 KB Created: 2020-08-30 05:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9725302e30dcfc9f3eea3c80036a777 SHA-1: 5345ee64182b88276e05a7aa1d14de054dd48ce1 SHA-256: 240c6fcfc494464732cb83bb862d1248b08a098bd3d0e9482e844adb081551e5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of these links, https://ttraff.cc/wix?keyword=degrees+of+comparison+adjectives+lesson+plan, is identified as a malicious redirector. The document body, though partially corrupted, also contains this URL, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=degrees+of+comparison+adjectives+lesson+plan
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/chemical_energy_transformed_into_mechanical_energy.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/characteristics_of_romanticism_literature.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/89075589578.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7126/files/antrenmanlarla_matematik_3_soru_zmleri.pdf
    • https://static.usrfiles.com/ugd/4ae4db_0e5598acd2e548d38fb1bf1f24035ef0.pdf
    • https://static.usrfiles.com/ugd/eb6612_041cd6a95e0c4ef8998c208629892bcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4bb41c7ee6b4b35a794a79d73f2bfab.pdf
    • https://static.usrfiles.com/ugd/b8c837_def89ea1257645e09c74abcd83d51160.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1dbbfb8f8a042a18d05d0f8565bf543.pdf
    • https://cdn.shopify.com/s/files/1/0436/8410/2297/files/google_sheet_conditional_formatting_duplicate.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/32744985205.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/gobogimipixusetozaso.pdf
    • https://cdn.shopify.com/s/files/1/0437/9030/3381/files/inspirao_e_canonicidade_da_bblia.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_off00007652.bin
3a9b9cc9b39f7b41187a9f02d3ad1d910e42b60ac08e586fdb842dfd6af430fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7652 5312 bytes
font_01_sfnt_off000088b6.bin
2b9bf530577114cd6151ec8046d6abc66aea21e29e39888315a90d3a34a6c6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88B6 5612 bytes
font_02_sfnt_off00009bc7.bin
2d221077d1f0edad8a6227d4d8d26aad086b59244c91f6587d8fc84d97adbb46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC7 10012 bytes

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