Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f0d3f30074f853…

MALICIOUS

PDF

36.3 KB Created: 2020-09-19 11:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dce047a47923e53a92f11081bf509b08 SHA-1: d80e4217fe8f993ad7d6aa51e2a0d74f07ec19ac SHA-256: e7f0d3f30074f85340d0d0bf5b197f418bc27b07da154194e3da4971804adda8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Audacity 2.3.0 system requirements' and a URL that mirrors this theme, suggesting a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links further indicates a link farm or SEO poisoning attempt.

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.me/wix?keyword=audacity+2.3.0+system+requirements
    • http://files.milehighed.org/uploads/1/3/1/6/131606111/zidak.pdf
    • http://files.piltzfamily.waggamatters.com/uploads/1/3/1/8/131871585/1357589.pdf
    • http://files.creamandshuga.com/uploads/1/3/1/4/131453592/a95e4.pdf
    • http://zejikez.aviscafineart.com/uploads/1/3/1/4/131437121/3f654f92df1c2.pdf
    • http://kewufejum.inthepinesboutique.com/uploads/1/3/1/1/131163635/2986181.pdf
    • https://5094878b-c709-4ba9-bd17-c50f0db5fefa.filesusr.com/ugd/bc4951_65f39338e4fc499dbd5f382c065db26c.pdf?index=true
    • https://85c7f95e-519e-4b0c-af23-c2af4af92209.filesusr.com/ugd/b16523_f4820af64ed74a3a9e5106f588112bc2.pdf?index=true
    • https://0e7c527c-bc90-41e0-a3ec-3f183357ff70.filesusr.com/ugd/df4650_199a12f6c8f7415fb88035d79b44e1ca.pdf?index=true
    • https://62f92c76-7419-4fc5-9d2f-dc6391cd7351.filesusr.com/ugd/eb4c03_7885e5cb66c2443080d45e608b09b595.pdf?index=true
    • https://f712c3a3-d3f1-4d1f-aab9-d87380eba8b6.filesusr.com/ugd/eddc50_172fb6e9ee2141dea99738af72471f75.pdf?index=true
    • https://fcffd258-5c98-4ee0-ab56-c156c6b1cadb.filesusr.com/ugd/2eec94_2cd9b82475fc42ba9b9cb40aad2ad017.pdf?index=true
    • https://f7bf8aa6-8a9a-4f23-94e5-5af386a2cbd9.filesusr.com/ugd/f90bad_42c2c309a7ee41849d29871f6fab953c.pdf?index=true
    • https://57b1a478-9cc5-466f-aed0-bad179244b96.filesusr.com/ugd/7d21c0_31658eeee2fa46c6ab1df2fe6df57e1c.pdf?index=true
    • https://6a663176-9a1c-44ae-b875-976a43145ced.filesusr.com/ugd/49488e_ac7bae4909984cee83a30d5c45fa2ed9.pdf?index=true
    • https://d89c84fc-4eff-4c59-b445-6566b4b3221b.filesusr.com/ugd/f65518_404f958d5c924d1da53fcf24f3b89453.pdf?index=true
    • 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/
    • https://d89c84fc-4eff-4c59-b445-6566b4b3221b.filesusr.com/ugd/f65518_404f958d5c924d1da53fcf24f3b89453.pdf?index=tru

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e45.bin
323f73969baab40b346555b8144d295022b52e570604b49f887a1485958f6f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E45 5740 bytes
font_01_sfnt_off000061bd.bin
57284b8219ce4cffb36968c69d5cd62bf24a0c9452ca3d328993a6886817bb54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BD 10112 bytes

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