Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0936a8a8ae515b…

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 03:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e91a787d89277496a5c9e74f443dfd2b SHA-1: 1721279d3e23560b1bbb51d72dde3d25e93fde71 SHA-256: 9d0936a8a8ae515b3f1a556579d0fe6bd4193d86163fec0fc0e0b7dba559fc6f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/wix?keyword=every+who+down+in+whoville', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain this URL, suggesting the primary intent is to trick the user into visiting this malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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=every+who+down+in+whoville
    • https://static.usrfiles.com/ugd/a86d68_e2a9df111287472eb9f4ef9ae0cc6330.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5eb5ae4d6544599a977c6d99d24de4d.pdf
    • https://static.usrfiles.com/ugd/af0aa9_d8d4fd24492a4c0381557192ebcb9990.pdf
    • https://static.usrfiles.com/ugd/b8c837_729d691f03ea498285c983a66500103a.pdf
    • https://static.usrfiles.com/ugd/cc14e4_d44329f84ef0415c982275d1a6a7b4d9.pdf
    • https://cdn.shopify.com/s/files/1/0433/7745/9365/files/39476528800.pdf
    • https://cdn.shopify.com/s/files/1/0462/8463/6320/files/punokafarip.pdf
    • https://cdn.shopify.com/s/files/1/0429/3771/2806/files/pozuvafil.pdf
    • https://cdn.shopify.com/s/files/1/0438/0642/5249/files/46602145377.pdf
    • https://cdn.shopify.com/s/files/1/0432/8698/6908/files/tisuzamofipurazozuretub.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_off00005854.bin
e3a494e7ac1fec09f13a82db494c54ab15d92755dd9ef715b6d440100f047a57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5854 4444 bytes
font_01_sfnt_off00006760.bin
6aaf916edad297e48471ce6c870af76800db12434e06a80dbb00e6c517121a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6760 10120 bytes
font_02_sfnt_off00008a08.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A08 4324 bytes

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